Submission #891305

#	Time	Username	Problem	Language	Result	Execution time	Memory
891305		Irate	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	172 ms	88912 KiB

joi2019_ho_t1

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

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<vector<char>>grid(n + 1, vector<char>(m + 1));
    for(int i = 1;i <= n;++i){
        for(int j = 1;j <= m;++j){
            cin >> grid[i][j];
        }
    }
    vector<vector<int>>orbs(n + 1, vector<int>(m + 1));
    
    for(int i = 1;i <= n;++i){
        for(int j = m;j >= 1;--j){
            if(j + 1 <= m)orbs[i][j] = orbs[i][j + 1] + (grid[i][j] == 'O');
            else orbs[i][j] = (grid[i][j] == 'O');
        }
    }
    vector<vector<int>>ingots(n + 1, vector<int>(m + 1));
    for(int i = n;i >= 1;--i){
        for(int j = 1;j <= m;++j){
            if(i + 1 <= n)ingots[i][j] = ingots[i + 1][j] + (grid[i][j] == 'I');
            else ingots[i][j] = (grid[i][j] == 'I');
        }
    }
    long long res = 0;
    for(int i = 1;i <= n;++i){
        for(int j = 1;j <= m;++j){
            if(grid[i][j] == 'J'){
                res += ingots[i][j] * orbs[i][j];
            }
        }
    }
    cout << res;
}

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