Altered Algorithm
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e2hang
216
Algorithm/BackTracking/N-Queen-RemoveRepeated.cpp
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216
Algorithm/BackTracking/N-Queen-RemoveRepeated.cpp
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#include <bits/stdc++.h>
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using namespace std;
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vector<vector<int>> solutions;
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string serialize(const vector<int>& path) {
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string s;
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for (int x : path) s += char(x + '0');
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return s;
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}
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// <20><><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><D0BB><EFBFBD> vector<int>
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vector<int> deserialize(const string& s) {
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vector<int> path;
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for (char c : s) path.push_back(c - '0');
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return path;
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}
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת 90<39>㣨˳ʱ<CBB3>룩<EFBFBD><EBA3A9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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vector<int> rotate90(const vector<int>& path, int n) {
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vector<int> newPath(n);
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for (int i = 0; i < n; i++) {
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newPath[path[i]] = n - 1 - i;
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}
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return newPath;
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}
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ˮƽ<CBAE><C6BD>ת<EFBFBD><D7AA>
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vector<int> mirrorH(const vector<int>& path, int n) {
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vector<int> newPath(n);
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for (int i = 0; i < n; i++) newPath[i] = n - 1 - path[i];
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return newPath;
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}
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>ĶԳƱ<D4B3>ʾ
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string canonical(const vector<int>& path, int n) {
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vector<string> forms;
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vector<int> cur = path;
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// 4 <20><><EFBFBD><EFBFBD>ת + <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת
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for (int k = 0; k < 4; k++) {
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forms.push_back(serialize(cur));
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forms.push_back(serialize(mirrorH(cur, n)));
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cur = rotate90(cur, n);
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}
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return *min_element(forms.begin(), forms.end());
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}
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bool isValid(const vector<int>& path, int row, int col) {
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for (int i = 0; i < row; i++) {
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int prevCol = path[i];
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if (prevCol == col) return false; // ͬ<>г<EFBFBD>ͻ
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if (abs(row - i) == abs(col - prevCol)) return false; // <20>Խ<EFBFBD><D4BD>߳<EFBFBD>ͻ
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}
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return true;
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}
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//path[i] = j; (i, j)<29><><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><D0B6><EFBFBD>
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void dfs(int _n, vector<int>& _path, int _i){
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if(_i == _n){
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solutions.push_back(_path);
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return;
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}
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for(int j = 0; j < _n; j++){
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//<2F><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>
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if(isValid(_path, _i, j)){
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_path[_i] = j;
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>path
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dfs(_n, _path, _i + 1);
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//<2F>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD><EFBFBD>path
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_path[_i] = -1;
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}
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}
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}
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int main(){
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//<2F><><EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD><C8B7><EFBFBD>ÿ<EFBFBD><C3BF><EFBFBD>ʺ<EFBFBD>λi<CEBB><69><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD>ƶ<EFBFBD><C6B6><EFBFBD>/<2F><><EFBFBD><EFBFBD>ȷ<EFBFBD><C8B7>
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//ÿ<><C3BF><EFBFBD>ʺ<EFBFBD><CABA>ı<EFBFBD>־<EFBFBD><D6BE><EFBFBD><EFBFBD>(i)<29><><EFBFBD><EFBFBD><EFBFBD>ɵ<EFBFBD><C9B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǵ<EFBFBD>1 - N<>в<EFBFBD><D0B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еĻʺ<C4BB>
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int n;
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cin >> n;
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//vector<vector<int>> mat(n, vector<int>(n, 0));
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vector<int> path(n, -1);
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dfs(n, path, 0);
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for(auto x : solutions){
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for(auto y : x){
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cout << y << " ";
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}
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cout << endl;
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}
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cout << endl;
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set<string> uniqueSolutions;
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for (auto& sol : solutions) {
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uniqueSolutions.insert(canonical(sol, n));
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}
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cout << "<EFBFBD><EFBFBD><EFBFBD>ʲ<EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: " << uniqueSolutions.size() << endl;
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// <20><><EFBFBD><EFBFBD>ȥ<EFBFBD>غ<EFBFBD><D8BA>Ľ<EFBFBD>
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for (auto& s : uniqueSolutions) {
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vector<int> path = deserialize(s);
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for (int x : path) cout << x << " ";
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cout << endl;
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}
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return 0;
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}
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/*
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8
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0 4 7 5 2 6 1 3
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0 5 7 2 6 3 1 4
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0 6 3 5 7 1 4 2
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0 6 4 7 1 3 5 2
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1 3 5 7 2 0 6 4
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1 4 6 0 2 7 5 3
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1 4 6 3 0 7 5 2
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1 5 0 6 3 7 2 4
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1 5 7 2 0 3 6 4
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1 6 2 5 7 4 0 3
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1 6 4 7 0 3 5 2
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1 7 5 0 2 4 6 3
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2 0 6 4 7 1 3 5
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2 4 1 7 0 6 3 5
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2 4 1 7 5 3 6 0
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2 4 6 0 3 1 7 5
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2 4 7 3 0 6 1 5
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2 5 1 4 7 0 6 3
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2 5 1 6 0 3 7 4
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2 5 1 6 4 0 7 3
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2 5 3 0 7 4 6 1
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2 5 3 1 7 4 6 0
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2 5 7 0 3 6 4 1
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2 5 7 0 4 6 1 3
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2 5 7 1 3 0 6 4
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2 6 1 7 4 0 3 5
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2 6 1 7 5 3 0 4
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2 7 3 6 0 5 1 4
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3 0 4 7 1 6 2 5
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3 0 4 7 5 2 6 1
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3 1 4 7 5 0 2 6
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3 1 6 2 5 7 0 4
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3 1 6 2 5 7 4 0
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3 1 6 4 0 7 5 2
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3 1 7 4 6 0 2 5
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3 1 7 5 0 2 4 6
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3 5 0 4 1 7 2 6
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3 5 7 1 6 0 2 4
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3 5 7 2 0 6 4 1
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3 6 0 7 4 1 5 2
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3 6 2 7 1 4 0 5
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3 6 4 1 5 0 2 7
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3 6 4 2 0 5 7 1
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3 7 0 2 5 1 6 4
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3 7 0 4 6 1 5 2
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3 7 4 2 0 6 1 5
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4 0 3 5 7 1 6 2
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4 0 7 3 1 6 2 5
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4 0 7 5 2 6 1 3
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4 1 3 5 7 2 0 6
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4 1 3 6 2 7 5 0
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4 1 5 0 6 3 7 2
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4 1 7 0 3 6 2 5
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4 2 0 5 7 1 3 6
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4 2 0 6 1 7 5 3
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4 2 7 3 6 0 5 1
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4 6 0 2 7 5 3 1
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4 6 0 3 1 7 5 2
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4 6 1 3 7 0 2 5
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4 6 1 5 2 0 3 7
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4 6 1 5 2 0 7 3
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4 6 3 0 2 7 5 1
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4 7 3 0 2 5 1 6
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4 7 3 0 6 1 5 2
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5 0 4 1 7 2 6 3
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5 1 6 0 2 4 7 3
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5 1 6 0 3 7 4 2
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5 2 0 6 4 7 1 3
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5 2 0 7 3 1 6 4
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5 2 0 7 4 1 3 6
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5 2 4 6 0 3 1 7
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5 2 4 7 0 3 1 6
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5 2 6 1 3 7 0 4
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5 2 6 1 7 4 0 3
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5 2 6 3 0 7 1 4
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5 3 0 4 7 1 6 2
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5 3 1 7 4 6 0 2
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5 3 6 0 2 4 1 7
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5 3 6 0 7 1 4 2
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5 7 1 3 0 6 4 2
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6 0 2 7 5 3 1 4
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6 1 3 0 7 4 2 5
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6 1 5 2 0 3 7 4
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6 2 0 5 7 4 1 3
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6 2 7 1 4 0 5 3
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6 3 1 4 7 0 2 5
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6 3 1 7 5 0 2 4
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6 4 2 0 5 7 1 3
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7 1 3 0 6 4 2 5
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7 1 4 2 0 6 3 5
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7 2 0 5 1 4 6 3
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7 3 0 2 5 1 6 4
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<EFBFBD><EFBFBD><EFBFBD>ʲ<EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: 12
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0 4 7 5 2 6 1 3
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0 5 7 2 6 3 1 4
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1 3 5 7 2 0 6 4
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1 4 6 0 2 7 5 3
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1 4 6 3 0 7 5 2
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1 5 0 6 3 7 2 4
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1 5 7 2 0 3 6 4
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1 6 2 5 7 4 0 3
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1 6 4 7 0 3 5 2
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2 4 1 7 0 6 3 5
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2 4 7 3 0 6 1 5
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2 5 1 4 7 0 6 3
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*/
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