Submission #498269

#	Time	Username	Problem	Language	Result	Execution time	Memory
498269		beepbeepsheep	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	181 ms	221096 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define endl '\n'
typedef pair<ll,ll> ii;
const ll mod=1e9+7;
const ll maxn=3005;
const ll inf=1e15;

ll grid[maxn][maxn][3];
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll r,c;
    string s;
    cin>>r>>c;
    for (int i=1;i<=r;i++){
        cin>>s;
        for (int j=1;j<=c;j++){
            if (s[j-1]=='J') grid[i][j][2]=1;
            if (s[j-1]=='O') grid[i][j][0]=1;
            if (s[j-1]=='I') grid[i][j][1]=1;
        }
    }
    ll ans=0;
    for (int i=maxn-2;i>=0;i--){
        for (int j=maxn-2;j>=0;j--){
            grid[i][j][0]+=grid[i][j+1][0];
            grid[i][j][1]+=grid[i+1][j][1];
            ans+=grid[i][j][0]*grid[i][j][1]*grid[i][j][2];
        }
    }
    cout<<ans;
    return 0;
}

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