Submission #120482

#	Time	Username	Problem	Language	Result	Execution time	Memory
120482		achibasadzishvili	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	439 ms	160040 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define ll long long
#define f first
#define s second
#define pb push_back
using namespace std;
ll n,m,O[3003][3003],I[3003][3003],ans;
string s[3005];
int main(){
    ios::sync_with_stdio(false);
    
    cin >> n >> m;
    
    for(int i=1; i<=n; i++){
        cin >> s[i];
        for(int j=m-1; j>=0; j--)
            O[i][j] = O[i][j + 1] + (s[i][j] == 'O');
    }
    
    for(int i=0; i<m; i++)
        for(int j=n; j>=1; j--)
            I[j][i] = I[j + 1][i] + (s[j][i] == 'I');
    
    for(int i=1; i<=n; i++)
        for(int j=0; j<m; j++)
            if(s[i][j] == 'J')
                ans += O[i][j] * I[i][j];
    
    
    cout << ans << endl;
    
    
    
    return 0;
}

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