제출 #105992

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
105992		Hideo	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	980 ms	88812 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back
#define mk make_pair
#define fr first
#define sc second
#define vi vector < int >
#define vl vector < ll >
#define pi pair < int, int >
#define pii pair < int, pi >
#define vii vector < pi >

const int N = 3007;
const int INF = 1e9 + 7;

char a[N][N];
int orb[N][N], ing[N][N];
int n, m;

ll ans;

main(){
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            cin >> a[i][j];

    for (int i = 1; i <= n; i++){
        for (int j = m; j >= 1; j--){
            orb[i][j] = orb[i][j + 1];
            if (a[i][j] == 'O')
                orb[i][j]++;
        }
    }
    for (int j = 1; j <= m; j++){
        for (int i = n; i >= 1; i--){
            ing[i][j] = ing[i + 1][j];
            if (a[i][j] == 'I')
                ing[i][j]++;
        }
    }
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            if (a[i][j] == 'J')
                ans += (ll) orb[i][j] * ing[i][j];
    cout << ans;
}

컴파일 시 표준 에러 (stderr) 메시지

joi2019_ho_t1.cpp:24:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

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