Submission #1128743

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128743		Noproblem29	Bomb (IZhO17_bomb)	C++20	100 / 100	327 ms	76800 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;
int a[N][N];
int L[N][N],R[N][N];
int y[N];
void test(){
    cin>>n>>m;
    for(int i=0;i<=n;i++){
        y[i]=m+1;
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            char x;
            cin>>x;
            a[i][j]=x-'0';

        }
    }
    for(int i=1;i<=n;i++){
        int cur=0;
        for(int j=1;j<=m;j++){
            if(a[i][j]){
                L[i][j]=L[i][j-1]+1;
            }
            else{
                L[i][j]=0;
            }
        }
        for(int j=m;j>=1;j--){
            if(a[i][j]){
                R[i][j]=R[i][j+1]+1;
            }
            else{
                R[i][j]=0;
            }
        }
        for(int j=1;j<=m;j++){
            if(a[i][j]){
                y[1]=min(y[1],L[i][j]+R[i][j]-1);
            }
        }
    }
    int x=n;
    for(int j=1;j<=m;j++){
        int tl=m;
        int tr=m;
        int res=0;
        for(int i=1;i<=n;i++){
            if(a[i][j]){
                res++;
                tl=min(tl,L[i][j]);
                tr=min(tr,R[i][j]);
                y[res]=min(y[res],tr+tl-1);
            }
            else{
                if(res>0){
                    x=min(x,res);
                }
                res=0;
                tl=m;
                tr=m;
            }
        }
        if(res>0){
            x=min(x,res);
        }
        res=0;
        tl=m;
        tr=m;
        for(int i=n;i>=1;i--){
            if(a[i][j]){
                res++;
                tl=min(tl,L[i][j]);
                tr=min(tr,R[i][j]);
                y[res]=min(y[res],tr+tl-1);
            }
            else{
                if(res>0){
                    x=min(x,res);
                }
                res=0;
                tl=m;
                tr=m;
            }
        }
        if(res>0){
            x=min(x,res);
        }
    }
    int ans=0;
    for(int i=1;i<=x;i++){
        y[i]=min(y[i-1],y[i]);
        ans=max(ans,i*y[i]);
    }
    cout<<ans<<'\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: 100 / 100