Submission #121834

#	Time	Username	Problem	Language	Result	Execution time	Memory
121834		baluteshih	Ideal city (IOI12_city)	C++14	32 / 100	1077 ms	4480 KiB

city

#include <bits/stdc++.h>
#define jizz ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define pb push_back
#define ET cout << "\n"
#define MEM(i,j) memset(i,j,sizeof i)
#define F first
#define S second
#define MP make_pair
#define ALL(v) v.begin(),v.end()
#define DB(a,s,e) {for(int i=s;i<e;++i) cout << a[i] << " ";ET;}
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

int dx[4]={1,-1,0,0},dy[4]={0,0,1,-1};
const int MOD=1e9;
vector<int> G[100005];
bitset<100005> vis;
unordered_map<ll,int> mp;

int DistanceSum(int N, int *X, int *Y)
{
	int ans=0;
	for(int i=0;i<N;++i)
		mp[(ll)X[i]<<31|Y[i]]=i;
	for(int i=0;i<N;++i)
		for(int j=0;j<4;++j)
		{
			auto p=mp.find(((ll)(X[i]+dx[j])<<31)|(Y[i]+dy[j]));
			if(p!=mp.end()) G[i].pb(p->S);
		}
	for(int i=0;i<N;++i)
	{
		int tp=0;
		queue<pii> q;
		q.push(MP(i,0)),vis.reset(),vis[i]=1;
		while(!q.empty())
		{
			auto tmp=q.front();
			q.pop(),ans=(ans+tmp.S)%MOD,vis[tmp.F]=1;
			for(int j:G[tmp.F])
				if(!vis[j]) q.push(MP(j,tmp.S+1)),vis[j]=1;
			++tp;
		}
	}
	return ans/2;
}

• Subtask 1: 11 / 11
• Subtask 2: 21 / 21
• Subtask 3: 0 / 23
• Subtask 4: 0 / 45