제출 #1179599

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1179599		user736482	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	136 ms	150444 KiB

joi2019_ho_t1

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pb push_back
#define ff first
#define ss second
#define MOD 1000000009
#define INF 1000000019
#define INFL 1000000000000000099LL

ll n,q,s,t,a,b,c,ans,k,m;
ll dp[3007][3007][2];
char co[3007][3007];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>m;
    for(ll i=0;i<n;i++){
        for(ll j=0;j<m;j++){
            cin>>co[i][j];
        }
    }
    for(ll i=n-1;i>=0;i--){
        for(ll j=m-1;j>=0;j--){
            dp[i][j][0]=dp[i+1][j][0];
            dp[i][j][1]=dp[i][j+1][1];
            if(co[i][j]=='O')
                dp[i][j][1]++;
            else if(co[i][j]=='I')
                dp[i][j][0]++;
            else
                ans+=dp[i][j][0]*dp[i][j][1];
        }
    }
    cout<<ans;

}

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