Submission #877607

#	Time	Username	Problem	Language	Result	Execution time	Memory
877607		JakobZorz	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	181 ms	89712 KiB

joi2019_ho_t1

#include<iostream>
#include<vector>
#include<queue>
#include<stack>
#include<algorithm>
#include<limits.h>
#include<math.h>
#include<map>
#include<set>
#include<unordered_map>
#include<unordered_set>
#include<iomanip>
#include<cstring>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
using namespace std;
const int MOD=1e9+7;
//typedef pair<ll,ll>Point;
//typedef pair<ll,ll>Line;
//#define x first
//#define y second

int w,h;
string arr[3000];
int numo[3000][3000];
int numi[3000][3000];

void solve(){
    cin>>w>>h;
    for(int x=0;x<w;x++){
        cin>>arr[x];
    }
    
    for(int x=0;x<w;x++){
        for(int y=h-1;y>=0;y--){
            if(y!=h-1)
                numo[x][y]=numo[x][y+1];
            if(arr[x][y]=='O')
                numo[x][y]++;
        }
    }
    
    for(int y=0;y<h;y++){
        for(int x=w-1;x>=0;x--){
            if(x!=w-1)
                numi[x][y]=numi[x+1][y];
            if(arr[x][y]=='I')
                numi[x][y]++;
        }
    }
    
    ll res=0;
    for(int x=0;x<w;x++){
        for(int y=0;y<h;y++){
            if(arr[x][y]=='J'){
                res+=(ll)numi[x][y]*numo[x][y];
                //cout<<res<<"\n";
            }
        }
    }
    
    cout<<res<<"\n";
}

int main(){
    ios::sync_with_stdio(false);cout.tie(NULL);cin.tie(NULL);
    //freopen("bank.in","r",stdin);freopen("bank.out","w",stdout);
    int t=1;//cin>>t;
    while(t--)solve();
    return 0;
}

/*
 
4 4
JJOO
JJOO
IIJO
IIIJ

3 4
JOIJ
JIOO
IIII
 
 */

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