Submission #418278

#	Time	Username	Problem	Language	Result	Execution time	Memory
418278		Autumn	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	328 ms	156108 KiB

joi2019_ho_t1

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

#define int int64_t

void calc(vector<vector<int>> &aha, int h, int w, bool how){
    if(how){    
        for(int i=h-1;i>=0;i--){
            for(int j=w-2;j>=0;j--){
                aha[i][j]+=aha[i][j+1];
            }
        }
        return;
    }
    for(int i=w-1;i>=0;i--){
        for(int j=h-2;j>=0;j--){
            aha[j][i]+=aha[j+1][i];
        }
    }
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int h,w;
    cin>>h>>w;
    vector<string> grid(h);
    vector<vector<int>> orbs(h,vector<int> (w,0));
    vector<vector<int>> ingots(h,vector<int> (w,0));
    for(int i=0;i<h;i++){
        cin>>grid[i];
        for(int j=0;j<w;j++){
            if(grid[i][j]=='O'){
                orbs[i][j]++;
            }else if(grid[i][j]=='I'){
                ingots[i][j]++;
            }
        }
    }
    calc(orbs,h,w,true);
    calc(ingots,h,w,false);
    int sum=0;

    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            if(grid[i][j]=='J'){
                sum+=orbs[i][j]*ingots[i][j];

            }
        }
    }
    cout<<sum<<"\n";

}

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