Submission #705786

#	Time	Username	Problem	Language	Result	Execution time	Memory
705786		Abito	3D Histogram (COCI20_histogram)	C++17	20 / 110	2577 ms	85968 KiB

histogram

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
typedef unsigned long long ull;
using namespace std;
const int N=2e5+5;
int a[N],b[N],stv[2][25][N],st[25][N],lg[N],n;
void buildv(){
    for (int i=1;i<=n;i++) stv[0][0][i]=a[i];
    for (int i=1;i<=n;i++) stv[1][0][i]=b[i];
    for (int i=1;i<25;i++){
        for (int j=1;j+(1<<i)<=n+1;j++){
            stv[0][i][j]=min(stv[0][i-1][j],stv[0][i-1][j+(1<<(i-1))]);
            stv[1][i][j]=min(stv[1][i-1][j],stv[1][i-1][j+(1<<(i-1))]);
        }
    }
}
int queryv(int l,int r){
    int i=lg[r-l+1];
    return min(stv[0][i][l],stv[0][i][r-(1<<i)+1])*min(stv[1][i][l],stv[1][i][r-(1<<i)+1])*(r-l+1);
}
/*void build(){
    for (int i=0;i<25;i++){
        for (int j=1;j+(1<<i)<=n+1;j++){
            st[i][j]=queryv(j,j+(1<<i)-1);
        }
    }
    return;
}
int query(int l,int r){
    int i=lg[r-l+1];
    return max(st[i][l],st[i][r-(1<<i)+1]);
}*/
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    for (int i=2;i<N;i++) lg[i]=lg[i/2]+1;
    for (int i=0;i<2;i++){
        for (int j=0;j<25;j++){
            for (int k=0;k<N;k++) stv[i][j][k]=INT_MAX;
        }
    }
    cin>>n;
    for (int i=1;i<=n;i++) cin>>a[i]>>b[i];
    buildv();
    //build();
    int ans=0;
    for (int i=1;i<=n;i++){
        for (int j=i;j<=n;j++) ans=max(ans,queryv(i,j));
    }cout<<ans<<endl;
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 90