Submission #427758

#	Time	Username	Problem	Language	Result	Execution time	Memory
427758		Chaska	Bitaro the Brave (JOI19_ho_t1)	C++11	100 / 100	303 ms	17992 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 3005;
ll n,m,res,b[N],c[N];
char a[N][N];
int main()
{
    cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
    cin >> n >> m;
    for (int i=0;i<n;i++) for (int j=0;j<m;j++) cin >> a[i][j];
    for (int j=0;j<m;j++) for (int i=0;i<n;i++) if (a[i][j] == 'I') b[j]++;
    for (int i=0;i<n;i++) for (int j=0;j<m;j++) if (a[i][j] == 'O') c[i]++;
    for (int i=0;i<n;i++) for (int j=0;j<m;j++) 
        if (a[i][j] == 'J') res += b[j]*c[i]; 
        else if (a[i][j] == 'O') c[i]--; 
        else b[j]--;    
    cout << res;
    return 0;
}

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