Submission #1128705

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128705		the_ZHER	Bomb (IZhO17_bomb)	C++20	30 / 100	1103 ms	107988 KiB

bomb

#include <bits/stdc++.h>
#define int long long
#define boost ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
const int N = 2505;
const int inf = 1e9;
const int mod=1e9+7;
struct edge{
    int pos,val,t;
};
int dp[N][N];
string c[N];
int dp1[N][N];
int n,m;
signed main(){
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
    // boost 
    cin>>n>>m;
    for(int i=1;i<=n;i++){
            cin>>c[i];
            for(int j=0;j<m;j++){
            int x=0;
            if(c[i][j]=='1'){
                x=1;
            }
            dp[i][j+1]=dp[i-1][j+1]+dp[i][j]-dp[i-1][j]+x;
            }
    }
    int ans=0;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            int cnt=0;
            for(int y=1;y+i-1<=n;y++){
                for(int x=1;x+j-1<=m;x++){
                    int x1=x+(j-1);
                    int y1=y+(i-1);
                    int cnt=dp[y1][x1]-dp[y1][x - 1]-dp[y - 1][x1]+dp[y - 1][x - 1];
                    if(cnt==i*j){
                        dp1[y][x]++;
                        dp1[y1+1][x]--;
                        dp1[y][x1+1]--;
                        dp1[y1+1][x1+1]++;
                    }
                }
            }
            int cnt1=0;
            for(int y=1;y<=n;y++){
                for(int x=1;x<=m;x++){
                    dp1[y][x]+=dp1[y-1][x]+dp1[y][x-1]-dp1[y-1][x-1];
                    if(dp1[y][x]>0){
                        cnt1++;
                    }
                }
            }
            if(cnt1==dp[n][m]){
                ans=max(ans,i*j);
            }
            for(int i=1;i<=n;i++){
                for(int j=1;j<=m;j++){
                    dp1[i][j]=0;
                }
            }
        }
    }
    cout<<ans;
}

• Subtask 1: 30 / 100