Submission #701781

#	Time	Username	Problem	Language	Result	Execution time	Memory
701781		vjudge1	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	622 ms	84812 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define int long long
#define MOD 1000000007
#define all(x) x.begin(),x.end()
#define ff first
#define ss second
#define pb push_back

using namespace std;

int32_t main(){
    int n,m;
    cin>>n>>m;
    char arr[n][m];
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++)cin>>arr[i][j];
    }
    int a[n+5][m+5];
    memset(a,0,sizeof(a));
    for(int i=0;i<n;i++){
        for(int j=m-1;j>=0;j--){
            a[i][j]=a[i][j+1]+(arr[i][j]=='O');
        }
    }
    int ans=0;
    for(int j=0;j<m;j++){
        int x=0;
        for(int i=n-1;i>=0;i--){
            x+=(arr[i][j]=='I');
            if(arr[i][j]=='J')ans+=(x*a[i][j]);
        }
    }
    cout<<ans<<endl;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50