Submission #1128721

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128721		Noproblem29	Bomb (IZhO17_bomb)	C++20	19 / 100	94 ms	32260 KiB

bomb

#include<bits/stdc++.h>
using namespace std;
#ifndef BADGNU
#pragma GCC target("sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#endif
#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;
#define ll long long
// #define int ll
#define ld long double
#define y1 cheza
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
template<class T> using ordered_multiset = tree<T,null_type,less_equal<T>,rb_tree_tag,tree_order_statistics_node_update>;
const int N=2600;
const int M=5001;
const int B=447;
const int mod=998244353;
const ll INF=1e18;
const int dx[]={1,-1,0,0};
const int dy[]={0,0,1,-1};
const double eps=1e-6;
int n,m;
char a[N][N];
int pref[N][N];
int calc(int x1,int y1,int x2,int y2){
    return pref[x2][y2]-pref[x1-1][y2]-pref[x2][y1-1]+pref[x1-1][y1-1];
}
void test(){
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>a[i][j];
            a[i][j]^=1;
            pref[i][j]=pref[i-1][j]+pref[i][j-1]-pref[i-1][j-1]+a[i][j]-'0';
        }
    }
    int x=2500;
    int y=2500;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(a[i][j]=='1')continue;
            if(a[i][j-1]=='0'||a[i-1][j]=='0')continue;
            int l=i;
            int r=n;
            while(l<=r){
                int mid=(l+r)>>1ll;
                if(calc(i,j,mid,j)==0){
                    l=mid+1;
                }
                else{
                    r=mid-1;
                }
            }
            int x2=l-1;
            l=j;
            r=m;
            while(l<=r){
                int mid=(l+r)>>1ll;
                if(calc(i,j,x2,mid)==0){
                    l=mid+1;
                }
                else{
                    r=mid-1;
                }
            }
            int y2=l-1;
            x=min(x,(x2-i+1));
            y=min(y,(y2-j+1));
        }   
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(a[i][j]=='1')continue;
            if(a[i][j-1]=='0'||a[i-1][j]=='0')continue;
            int l=j;
            int r=m;
            while(l<=r){
                int mid=(l+r)>>1ll;
                if(calc(i,j,i,mid)==0){
                    l=mid+1;
                }
                else{
                    r=mid-1;
                }
            }
            int y2=l-1;
            l=i;
            r=n;
            while(l<=r){
                int mid=(l+r)>>1ll;
                if(calc(i,j,mid,y2)==0){
                    l=mid+1;
                }
                else{
                    r=mid-1;
                }
            }
            int x2=l-1;
            x=min(x,(x2-i+1));
            y=min(y,(y2-j+1));
        }   
    }
    cout<<x*y<<'\n';
}



/*

*/
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    // cout.tie(nullptr);
    int t2=1;
    // cin>>t2;
    for(int i=1;i<=t2;i++){
        test();
    }
}

• Subtask 1: 19 / 100