Submission #390701

#	Time	Username	Problem	Language	Result	Execution time	Memory
390701		wildturtle	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	623 ms	185600 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll a,b,c,d,i,e,f,g,n,m,k,l,ans;
ll A[5003][5003],B[5003][5003];
string s[5003];
int main() {
    cin>>n>>m;
    for(ll i=1;i<=n;i++) {
        cin>>s[i];
        a=0;
        for(ll j=m-1;j>=0;j--) {
            if(s[i][j]=='O') { a++; }
            A[i][j]=a;
        }
    }
    for(ll i=0;i<m;i++) {
        a=0;
        for(ll j=n;j>=1;j--) {
            if(s[j][i]=='I') a++;
            B[j][i]=a;
        }
    }
    for(ll i=1;i<=n;i++) {
        for(ll j=0;j<m;j++) {
            if(s[i][j]=='J') { ans+=A[i][j]*B[i][j]; }
        }
    }
    cout<<ans;
}

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