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#include <bits/stdc++.h> using namespace std; char mat[22][22]; short n; short dp[1 << 21]; vector<int> masks; int rec(int bitmask) { if(__builtin_popcount(bitmask) == n ) { return 0; } if(dp[bitmask] != -1) { return dp[bitmask]; } int res = 2e9; for(int i = 0; i < n; i++) { if(bitmask & (1 << i)) continue; res = min(res, rec(bitmask | (1 << i)) + __builtin_popcount(bitmask & masks[i])); } return dp[bitmask] = res; } int main() { ios_base::sync_with_stdio(false); cin >> n; for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { cin >> mat[i][j]; } int num = 0, pow = n - 1; for(int j = n - 1; j >= 0; j--) { if(mat[i][j] == 'D') { num |= (1 << pow); } pow--; } masks.push_back(num); } memset(dp, -1, sizeof dp); cout << rec(0) << endl; return 0; }
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