Submission #155809

#	Time	Username	Problem	Language	Result	Execution time	Memory
155809		Evirir	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	544 ms	159244 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define setp(x) cout<<fixed<<setprecision(x)
#define forn(i,a,b) for(int i=a;i<b;i++)
#define fore(i,a,b) for(int i=a;i<=b;i++)
#define pb push_back
#define F first
#define S second
#define INF 2e14
#define MOD 998244353
#define pqueue priority_queue
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;

#define MAXN 3005

ll hor[MAXN][MAXN];
ll ver[MAXN][MAXN];

int main()
{
	mset(hor,0); mset(ver,0);
	ios_base::sync_with_stdio(0); cin.tie(0);
	
	int n,m; cin>>n>>m;
	string arr[MAXN];
	forn(i,0,n) cin>>arr[i];
	
	for(int i=0;i<n;i++){
		for(int j=m-1;j>=0;j--){
			if(j<m-1) hor[i][j]+=hor[i][j+1];
			if(arr[i][j]=='O') hor[i][j]++;
		}
	}
	
	for(int j=0;j<m;j++){
		for(int i=n-1;i>=0;i--){
			if(i<n-1) ver[i][j]+=ver[i+1][j];
			if(arr[i][j]=='I') ver[i][j]++;
		}
	}
	
	ll ans=0;
	for(int i=0;i<n;i++){
		for(int j=0;j<m;j++){
			if(arr[i][j]!='J') continue;
			ans+=hor[i][j+1]*ver[i+1][j];
		}
	}
	
	cout<<ans<<'\n';
	
	return 0;
}

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