Submission #316779

#	Time	Username	Problem	Language	Result	Execution time	Memory
316779		amunduzbaev	Ideal city (IOI12_city)	C++14	11 / 100	6 ms	1152 KiB

city

//#include "grader.cpp"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
const int N=205, mod= 1e9;
int used[N][N], x[N], y[N], cnt, n, dist[N][N], pos[N][N], used1[N][N];
vector<vector<int>> edges(2005);
vector<pair<int,int>> pi;
void Dijkstra(int xx,int yy){
	//cout<<"=========================\n"<<xx<<" "<<yy<<"\n";
	memset(used1, 0, sizeof(used1));
	queue<pair<int, pair<int,int>>> q;
	q.push({0,{xx,yy}});
	used1[xx][yy]=1;
	while(!q.empty()){
		auto point = q.front();
		q.pop();
		int d = point.first, 
		a = point.second.first, 
		b = point.second.second;
		dist[pos[xx][yy]][pos[a][b]] = d;
		int cur = pos[a][b];
		for(auto x:edges[cur]){
			//cout<<pi[x].first<<" "<<pi[x].second<<"\n";
			if(used1[pi[x].first][pi[x].second]) continue;
			q.push({d+1, pi[x]});
			used1[pi[x].first][pi[x].second] = 1;
		}
	}
}
pair<int,int> four [4] = {{-1,0}, {+1,0}, {0,-1}, {0,+1}};
int DistanceSum(int N, int *X, int *Y) {
	n=N;
	for(int i=0;i<n;i++){
		x[i]=X[i];
		y[i]=Y[i];
		pi.pb({x[i], y[i]});
		used[x[i]][y[i]]=1;
		pos[x[i]][y[i]]=i;
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<4;j++){
			int x1 = x[i]+four[j].first, y1 = y[i]+four[j].second;
			if(used[x1][y1])
				edges[i].pb(pos[x1][y1]);
		}
	}
	for(int i=0;i<n;i++)
		Dijkstra(x[i], y[i]);

	int ans=0;
	for(int i=0; i<n; i++){
		for(int j=i+1; j<n;j++){
			ans += dist[i][j];
			ans %= mod;
		}
	}
 	return ans;
}

/*

11
2 5
2 6
3 3
3 6
4 3
4 4
4 5
4 6
5 3
5 4
5 6

*/

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