제출 #420071

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
420071		errorgorn	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	176 ms	160048 KiB

joi2019_ho_t1

//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << " is " << x << endl

#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define lb lower_bound
#define ub upper_bound

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
//change less to less_equal for non distinct pbds, but erase will bug

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int n,m;
string grid[3005];

ll arr[3005][3005];
ll brr[3005][3005];

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin.exceptions(ios::badbit | ios::failbit);
	
	cin>>n>>m;
	rep(x,0,n) cin>>grid[x];
	
	rep(x,n,0) rep(y,m,0){
		arr[x][y]=arr[x+1][y]+(grid[x][y]=='I');
	}
	
	rep(x,n,0) rep(y,m,0){
		brr[x][y]=brr[x][y+1]+(grid[x][y]=='O');
	}
	
	ll ans=0;
	rep(x,0,n) rep(y,0,m) if (grid[x][y]=='J'){
		ans+=arr[x][y]*brr[x][y];
	}
	
	cout<<ans<<endl;
}

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