Submission #842670

#	Time	Username	Problem	Language	Result	Execution time	Memory
842670		nonono	Soccer Stadium (IOI23_soccer)	C++17	Compilation error	0 ms	0 KiB

soccer

//#include "soccer.h"
#include <bits/stdc++.h>
using namespace std;

const int mxN = 505;

void upMax(int &x, int y) {
    x = max(x, y);
}

int sub1(int N, vector<vector<int>> F) {
    for(int i = 0; i < N; i ++) {
        for(int j = 0; j < N; j ++) {
            if(F[i][j] == 1) {
                return max({
                    N * i + N * j - i * j,
                    N * i + N * (N - j - 1) - i * (N - j - 1),
                    N * (N - i - 1) + N * j - (N - i - 1) * j,
                    N * (N - i - 1) + N * (N - j - 1) - (N - i - 1) * (N - j - 1)
                });
            }
        }
    }

    return N * N;
}

map<int, int> low[mxN][mxN];

int sub5(int N, vector<vector<int>> F) {
    vector<vector<int>> sum(N, vector<int> (N, 0)), high(N, vector<int> (N, 0));

    for(int i = 0; i < N; i ++) {
        for(int j = 0; j < N; j ++) {
            sum[i][j] = (j ? sum[i][j - 1] : 0) + F[i][j];
        }
    }

    auto get_sum = [&] (int row, int l, int r) {
        return sum[row][r] - (!l ? 0 : sum[row][l - 1]);
    };

    for(int i = 0; i < N; i ++) {
        for(int j = 0; j < N; j ++) {
            high[i][j] = (F[i][j] ? 0 : (i ? high[i - 1][j] : 0) + 1);
        }
    }

    for(int i = 0; i < N; i ++) {
        for(int k = 0; k < N; k ++) {
            int x = high[i][k];

            for(int j = k; j >= 0; j --) {
                x = min(x, high[i][j]);
                low[i][j][k] = x;
            }
        }
    }

    vector<vector<int>> dp(N, vector<int> (N, 0));
    int result = 0;

    for(int row = 0; row < N; row ++) {
        for(int i = 0; i < N; i ++) {
            for(int j = i; j < N; j ++) {
                if(get_sum(row, i, j)) dp[i][j] = 0;
            }
        }

        for(int i = 0, j = 0; i < N; i = j + 1) {
            for(j = i; j + 1 < N && F[row][j + 1] == F[row][i]; ) j ++ ;
            if(F[row][i]) continue ;

            for(int k = (j - i + 1); k > 0; k --) {
                for(int l = i; l + k - 1 <= j; l ++) {
                    int r = l + k - 1;

                    if(k > 1) {
                        if(l + 1 < N) upMax(dp[l + 1][r], dp[l][r] + low[row][l][r]);
                        if(r - 1 >= 0) upMax(dp[l][r - 1], dp[l][r] + low[row][l][r]);
                    } else {
                        upMax(result, dp[l][r] + low[row][l][r]);
                    }
                }
            }
        }
    }

    return result;
}

int biggest_stadium(int N, vector<vector<int>> F) {
    if(N <= 500) return sub5(N, F);
    return sub1(N, F);
}

int main() {
    #define taskname "test"

    if (fopen(taskname".inp", "r")) {
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }

    int N;
    cin >> N;

    vector<vector<int>> F(N, vector<int> (N));

    for(int i = 0; i < N; i ++) {
        for(int j = 0; j < N; j ++) {
            cin >> F[i][j];
        }
    }

    cout << biggest_stadium(N, F) << "\n";
    return 0;
}

Compilation message (stderr)

soccer.cpp: In function 'int main()':
soccer.cpp:101:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  101 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:102:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  102 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccnVZ9y8.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccXB88s8.o:soccer.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status