Submission #96389

#	Time	Username	Problem	Language	Result	Execution time	Memory
96389		choikiwon	Bomb (IZhO17_bomb)	C++17	24 / 100	729 ms	112520 KiB

bomb

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

const int MN = 2525;

int dx[4] = {0, 0, 1, -1};
int dy[4] = {1, -1, 0, 0};

int N, M;
char G[MN][MN];

int cc[MN][MN][4];
int dp(int r, int c, int d) {
    if(r < 0 || N <= r || c < 0 || M <= c) return 0;
    int &ret = cc[r][c][d];
    if(ret != -1) return ret;
    if(G[r][c] == '0') return 0;
    return ret = dp(r + dy[d], c + dx[d], d) + 1;
}

int main() {
    scanf("%d %d", &N, &M);

    for(int i = 0; i < N; i++) {
        scanf("\n");
        for(int j = 0; j < M; j++) {
            scanf("%c", &G[i][j]);
        }
    }

    memset(cc, -1, sizeof(cc));

    int mn1 = 1e9;
    int mn2 = 1e9;
    for(int i = 0; i < N; i++) for(int j = 0; j < M; j++) if(G[i][j] == '1') {
        mn1 = min(mn1, dp(i, j, 0) + dp(i, j, 1) - 1);
        mn2 = min(mn2, dp(i, j, 2) + dp(i, j, 3) - 1);
    }
    printf("%d", mn1 * mn2);
}

Compilation message (stderr)

bomb.cpp: In function 'int main()':
bomb.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &N, &M);
     ~~~~~^~~~~~~~~~~~~~~~~
bomb.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("\n");
         ~~~~~^~~~~~
bomb.cpp:27:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%c", &G[i][j]);
             ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 24 / 100