Submission #870847

#	Time	Username	Problem	Language	Result	Execution time	Memory
870847		vjudge1	Sajam (COCI18_sajam)	C++17	0 / 90	5057 ms	2188 KiB

sajam

//author: Ahmet Alp Orakci
#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define int i64

const int MAXN = 1E3 + 5;

char matrix[MAXN][MAXN];

char f(char x) {
    if(x == 'o')
        return 'x';
    else if(x == 'x')
        return 'o';
    else
        return assert(false), char(23);
}

#define ONLINE_JUDGE
void solve() {
    int n, k;
    cin >> n >> k;

    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            cin >> matrix[i][j];
        }
    }

    auto reversex = [&](int x) -> void {
        for(int i = 1; i <= n; i++) {
            matrix[i][x] = f(matrix[i][x]);
        }
    };
    
    auto reversey = [&](int x) -> void {
        for(int i = 1; i <= n; i++) {
            matrix[x][i] = f(matrix[x][i]);
        }
    };

    int anss = k +1;
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            if(matrix[i][j] == 'o') {
                reversex(j);
            }
        }

        int cnt = 0;
        for(int j = 1; j <= n; j++) {
            int nw = 0;
            for(int k = 1; k <= n; k++) {
                nw += matrix[k][j] == 'o';
            }

            cnt += min(nw, n - nw);
        }
        
        /*
        cerr << i << " :: " << cnt << "\n";
        for(int t = 1; t <= n; t++) {
            for(int l = 1; l <= n; l++) {
                cerr << matrix[t][l];
            }
            cerr << "\n";
        }
        */

        anss = min(anss, cnt);
    }

    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            if(matrix[j][i] == 'o') {
                reversey(j);
            }
        }

        int cnt = 0;
        for(int j = 1; j <= n; j++) {
            int nw = 0;
            for(int k = 1; k <= n; k++) {
                nw += matrix[j][k] == 'o';
            }

            cnt += min(nw, n - nw);
        }
        
        /*
        cerr << i << " :: " << cnt << "\n";
        for(int t = 1; t <= n; t++) {
            for(int l = 1; l <= n; l++) {
                cerr << matrix[t][l];
            }
            cerr << "\n";
        }
        */

        anss = min(anss, cnt);
    }

    cout << (anss <= k ? "DA" : "NE") << "\n";
    
    return;
}

signed main() {
    #ifndef ONLINE_JUDGE
        freopen(".in", "r", stdin);
        freopen(".out", "w", stdout);
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int t = 1; //cin >> t;
    for(int i = 1; i <= t; i++) {
        solve();
    }

    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 15