Submission #942036

#	Time	Username	Problem	Language	Result	Execution time	Memory
942036		carriewang	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	108 ms	160188 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define ll long long
#define vi vector<int>
#define vl vector<ll>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define sz(x) x.size()
#define all(x) x.begin(),x.end()
#define F first
#define S second
using namespace std;
const int maxn=3005;
ll h,w,a[maxn][maxn],b[maxn][maxn];
string s[maxn];
int main(){
    ios::sync_with_stdio(0),cin.tie(0);
    cin >> h >> w;
    for(int i=0;i<h;i++){
        cin >> s[i];
    }
    ll ans=0;
    for(int i=h-1;i>=0;i--){
        for(int j=w-1;j>=0;j--){
            a[i][j]=a[i+1][j];
            b[i][j]=b[i][j+1];
            if(s[i][j]=='I') a[i][j]++;
            else if(s[i][j]=='O') b[i][j]++;
            else ans+=a[i][j]*b[i][j];
        }
    }
    cout << ans << "\n";
}

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