Submission #394594

#	Time	Username	Problem	Language	Result	Execution time	Memory
394594		benedict0724	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	420 ms	114884 KiB

joi2019_ho_t1

#include <iostream>

using namespace std;

int v[3002][3002];
int dp[3002][3002];
int dp2[3002][3002];

int main()
{
    ios::sync_with_stdio(false); cin.tie(NULL);
    int H, W; cin >> H >> W;
    for(int i=1;i<=H;i++)
    {
        string s; cin >> s;
        for(int j=1;j<=W;j++)
        {
            if(s[j-1] == 'J') v[i][j] = 1;
            if(s[j-1] == 'O') v[i][j] = 2;
            if(s[j-1] == 'I') v[i][j] = 3;
        }
    }

    for(int i=1;i<=H;i++)
    {
        for(int j=W;j>=1;j--)
        {
            dp[i][j] = dp[i][j+1];
            if(v[i][j] == 2) dp[i][j]++;
        }
    }

    for(int j=1;j<=W;j++)
    {
        for(int i=H;i>=1;i--)
        {
            dp2[i][j] = dp2[i+1][j];
            if(v[i][j] == 3) dp2[i][j]++;
        }
    }

    long long int ans = 0;
    for(int i=1;i<=H;i++)
    {
        for(int j=1;j<=W;j++)
        {
            if(v[i][j] == 1) ans += dp[i][j] * dp2[i][j];
        }
    }

    cout << ans;
}

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