Submission #893508

#	Time	Username	Problem	Language	Result	Execution time	Memory
893508		Malix	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	384 ms	18396 KiB

joi2019_ho_t1

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

typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;

#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define MP make_pair

const int m=1e9+7;

int main(){
 //ios::sync_with_stdio(0);
// cin.tie(0);
//freopen("test_input.txt", "r", stdin);
//freopen("test_output.txt", "w", stdout);
    int a,b;cin>>a>>b;
    vector<vector<char>> grid(a,vector<char>(b));
    REP(i,0,a)REP(j,0,b)cin>>grid[i][j];
    vi ic(b,0),oc(a,0);
    REP(i,0,a)REP(j,0,b){
        if(grid[i][j]=='I')ic[j]++;
        else if(grid[i][j]=='O')oc[i]++;
    }
    ll ans=0;
    REP(i,0,a)REP(j,0,b){
         if(grid[i][j]=='I')ic[j]--;
         else if(grid[i][j]=='O')oc[i]--;
         else ans+=(ll)oc[i]*ic[j];
    }
    cout<<ans;
}

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