Submission #239124

#	Time	Username	Problem	Language	Result	Execution time	Memory
239124		aggu_01000101	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	362 ms	158968 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long
#define INF 1000000000000000
#define lchild(i) (i*2 + 1)
#define rchild(i) (i*2 + 2)
#define mid(l, u) ((l+u)/2)
#define x(p) p.first
#define y(p) p.second
#define MOD 998244353

using namespace std;
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int h, w;
    cin>>h>>w;
    char mat[h+1][w+1];
    int preo[h+1][w+1];
    int prer[h+1][w+1];
    for(int i = 1;i<=h;i++) for(int j = 1;j<=w;j++) preo[i][j] = prer[i][j] = 0;

    for(int i = 1;i<=h;i++){
        string s;
        cin>>s;
        for(int j = 1;j<=w;j++){
            mat[i][j] = s[j-1];
        }
    }
    int cnt = 0;
    for(int i = 1;i<=h;i++){
        preo[i][w] = (mat[i][w]=='O');
        for(int j = w-1;j>=1;j--){
            preo[i][j] = preo[i][j+1] + (mat[i][j]=='O');
        }
    }
    for(int j = 1;j<=w;j++){
        prer[h][j] = (mat[h][j] == 'I');
        for(int i = h-1;i>=1;i--){
            prer[i][j] = prer[i+1][j] + (mat[i][j]=='I');
        }
    }
    for(int i = 1;i<h;i++){
        for(int j = 1;j<w;j++){
            if(mat[i][j] == 'J') cnt += (preo[i][j+1] * prer[i+1][j]);
        }
    }
    cout<<cnt<<"\n";
}

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