08-14-25

Luogu/P1007 独木桥.cpp

@@ -0,0 +1,25 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+int main(){
+	int length, n;
+	int tmp;
+	int js;
+	vector<int> ma, mi;
+	cin >> length >> n;
+	for(int i = 0;i < n; i++){
+		cin >> tmp;
+		js = max(length - tmp + 1, tmp);
+		ma.push_back(js);
+		js = min(length - tmp + 1, tmp);
+		mi.push_back(js);
+	}
+	int smax = 0;
+	int smax2 = 0;
+	for(int i = 0;i < n; i++){
+		if(ma.at(i) > smax) smax = ma[i];
+		if(mi[i] > smax2) smax2 = mi[i];
+	}
+	cout << smax2 << " " << smax;
+	return 0;
+}

Luogu/P1011 [NOIP 1998 提高组] 车站.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+int main(){
+	vector<int> feb;
+	int n, a, m, x;
+	cin >> a >> n >> m >> x;
+	feb.reserve(n);
+	feb.push_back(1);feb.push_back(1);
+	for(int i = 2; i < n; i++){
+		feb[i] = feb[i - 1] + feb[i - 2];
+	} 
+	int b = (m - (feb[n - 4] + 1) * a) / (feb[n - 3] - 1);
+	int out = (feb[x - 3] + 1) * a + (feb[x - 2] - 1) * b;
+	cout << out << endl;
+	return 0;
+}
+//5 7 32 4
+

Luogu/P1012 [NOIP 1998 提高组] 拼数.cpp

@@ -1,31 +1,27 @@
-#include <cstring>
 #include <iostream>
+#include <set>
+#include <string>
 using namespace std;
+
+struct cmp{
+	bool operator()(const string& a, const string& b){
+		return a + b > b + a;
+	}
+};
+
 int main(){
-	char a[21][11];
-	char sum[220]="";
+	set<string, cmp> a;
 	int n;
-	cin>>n;
-	
-	for(int i=0;i<n;i++){
-		cin>>a[i];
+	cin >> n;
+	string tmp;
+	for(int i = 0;i < n; i++){
+		cin >> tmp;
+		a.emplace(tmp);
 	}
-	int js=1;
-	char tmp[11]="";
-	while(js!=0){
-		js=0;
-		for(int i=0;i<n-1;i++){
-			if(strcmp(a[i],a[i+1])<0){
-				strcpy(tmp,a[i+1]);	
-				strcpy(a[i+1],a[i]);
-				strcpy(a[i],tmp);
-				js++;
-			}
-		}
+	for(string x : a){
+		cout << x ;
 	}
-	for(int i=0;i<n;i++){
-		strcat(sum,a[i]);
-	}
-	cout<<sum<<endl;
+	cout << endl;
 	return 0;
 }
+

Luogu/P1015 [NOIP 1999 普及组] 回文数.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <string>
+#include <algorithm>
+using namespace std;
+
+int charToInt(char c) {
+    if (c >= '0' && c <= '9') return c - '0';
+    if (c >= 'A' && c <= 'Z') return c - 'A' + 10;
+    if (c >= 'a' && c <= 'z') return c - 'a' + 10;
+    return 0;
+}
+
+char intToChar(int x) {
+    if (x < 10) return '0' + x;
+    return 'A' + (x - 10);
+}
+
+string add(const string& a, int jz) {
+    string b(a);
+    reverse(b.begin(), b.end());
+    string tmp(a.size() + 1, '0');
+    int carry = 0;
+    for (size_t i = 0; i < a.size(); i++) {
+        int ia = charToInt(a[i]);
+        int ib = charToInt(b[i]);
+        int sum = ia + ib + carry;
+        carry = sum / jz;
+        tmp[i] = intToChar(sum % jz);
+    }
+    if (carry > 0) tmp[a.size()] = intToChar(carry);
+    else tmp.pop_back();
+    return tmp;
+}
+
+bool check(const string& x) {
+    return equal(x.begin(), x.begin() + x.size()/2, x.rbegin());
+}
+
+int main(){
+    int jz;
+    string n;
+    cin >> jz >> n;
+    for (int i = 0; i <= 30; i++) {
+        if (check(n)) {
+            cout << "STEP=" << i << endl;
+            return 0;
+        }
+        n = add(n, jz);
+    }
+    cout << "Impossible!" << endl;
+}
+