Submission #950909

#	Time	Username	Problem	Language	Result	Execution time	Memory
950909		star	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	246 ms	207664 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define N 3005
#define LL long long
#define pii pair<LL,LL>

LL h, w, ans;
char c;
LL o[N][N], i[N][N];
vector<pii> j;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    cin >> h >> w;
    for (int x=1; x<=h; x++)
        for (int y=1; y<=w; y++)
        {
            cin >> c;
            if (c=='J') j.push_back({x,y});
            o[x][y]=o[x][y-1]+(c=='O');
            i[x][y]=i[x-1][y]+(c=='I');
        }
    ans=0;
    for (auto now:j)
    {
        int a=now.first, b=now.second;
        ans+=(o[a][w]-o[a][b])*(i[h][b]-i[a][b]);
    }
    cout << ans;
    return 0;
}

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