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#include <iostream> #include <map> #include <cmath> #include <set> #include <vector> #include <queue> #include <algorithm> #include <cstring> #include <fstream> using namespace std; typedef long long ll; const int maxn = 22; char mat[maxn][maxn]; int main() { ios_base::sync_with_stdio(false); int n; cin >> n; for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { cin >> mat[i][j]; } } vector<int> v; for(int i = 0; i < n; i++) { v.push_back(i); } int res = 2e9; do { int c = 0; for(int i = 0; i < n; i++) { for(int j = 0; j < i; j++) { if(mat[v[i]][v[j]] == 'D') { c++; } } } res = min(res, c); } while(next_permutation(v.begin(), v.end())); cout << res << endl; return 0; } /* M.. ### ..V **/
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