Submission #886764

#	Time	Username	Problem	Language	Result	Execution time	Memory
886764		Maite_Morale	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	216 ms	160180 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define F first
#define S second
#define MAX 3005
#define oo 1e18
#define mod 1000000007
#define fast_in ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);cout.setf(ios::fixed);cout.precision(0);
using namespace std;
typedef long long ll;
#define pll pair<ll , ll>
#define vll vector<ll>
#define vvll vector<vll>
#define vpll vector<pll>
 
ll o[MAX][MAX],t[MAX][MAX],n,m;
string s[MAX]; 
int main(){
    fast_in
    cin>>n>>m;
    for(int i=0;i<n;i++){
        cin>>s[i];
        for(int j=m-1;j>=0;j--){
            o[i][j]=o[i][j+1];
            if(s[i][j]=='O')o[i][j]++;
        }
    }
    for(int j=m-1;j>=0;j--){
        for(int i=n-1;i>=0;i--){
            t[i][j]=t[i+1][j];
            if(s[i][j]=='I')t[i][j]++;
        }
    }ll r=0;
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            if(s[i][j]=='J'){
                r+=o[i][j]*t[i][j];
                
            }
        }
    }cout<<r;
return 0;
}

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