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Algorithm

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e2hang
2025-08-30 21:59:50 +08:00
parent 9077007670
commit daeec35f97
13 changed files with 453 additions and 0 deletions
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26
Algorithm/Maths/P1102 A-B数对/P1102 A-B 数对 unordered_map.cpp Normal file
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#include <unordered_map>
#include <vector>
#include <iostream>
//<2F><> hash + map <20><>ԭ<EFBFBD><D4AD><EFBFBD>Dz<EFBFBD>ϣ<EFBFBD><CFA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD> O(n^2)
using namespace std;
int main(){
unordered_map<long long, int> s;
vector<long long> arr;
long long n, m;
cin >> n >> m;
long long tmp;
for(int i = 0; i < n; i++){
cin >> tmp;
arr.push_back(tmp);
s[tmp]++;
}
long long need;
long long js = 0;
for(int i = 0; i < n; i++){
need = arr[i] - m;
if(s.count(need)) js += s[need];//s[need]<5D><>ֵ<EFBFBD><D6B5> pair.seconds
//s.emplace(make_pair(arr[i], 1));//<2F><><EFBFBD>У<EFBFBD><D0A3><EFBFBD><EFBFBD><EFBFBD>arr[i]<5D><><EFBFBD>ڣ<EFBFBD><DAA3><EFBFBD>ֱ<EFBFBD>ӷ<EFBFBD><D3B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
}
cout << js << endl;
return 0;
}