Submission #833257

#	Time	Username	Problem	Language	Result	Execution time	Memory
833257		vjudge1	Bomb (IZhO17_bomb)	C++17	12 / 100	55 ms	65100 KiB

bomb

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#include <bits/stdc++.h>

using namespace std;

const int N = 3e3;

int markas[N][N];
int jarak[N][N];
bool ada = true;
int mn[N];
int mx = 0;


void solve(){
    int n, m;
    cin >> n >> m;
    memset(jarak, 0, sizeof(jarak));
    memset(mn, -1, sizeof(mn));
    int mnPjg = n*m;
    for(int i = 1; i <= n; i++){
        string s;
        cin >> s;
        for(int j = 1; j <= m; j++){
            markas[i][j] = s[j - 1] - '0';
        }
    }
    for(int i = 1; i <= n; i++){
        for(int j = m; j >= 1; j--){
            jarak[i][j] = jarak[i][j + 1] + 1;
            if(!markas[i][j]){
                jarak[i][j] = 0;
            }
        }
    }
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            if(markas[i][j] == 1 && markas[i - 1][j] == 0 && markas[i][j - 1] == 0){
                int k = i;
                int curP = jarak[k][j];
                mnPjg = min(mnPjg, curP);
                while(jarak[k][j] != 0){
                    k++;
                    if(jarak[k][j] < curP){
                        if(mn[curP] == -1){
                            mn[curP] = k - i;
                        }else{
                            mn[curP] = min(mn[curP], k - i);
                        }
                        curP = jarak[k][j];
                    }
                }
                if(mn[curP] == -1){
                    mn[curP] = k - i;
                }else{
                    mn[curP] = min(mn[curP], k - i);
                }
            }
        }
    }
    for(int i = mnPjg; i >= 0; i--){
        if(mn[i] == -1){
            mn[i] = mn[i + 1];
        }
    }
    for(int i = 1; i <= mnPjg; i++){
        mn[i] = min(mn[i], mn[i - 1]);
        mx = max(mx, mn[i]*i);
    }
    cout << mx << endl;
    
    
    
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    t = 1;
    while(t--){
        solve();
    }

    return 0;
}

• Subtask 1: 12 / 100