Submission #576468

#	Time	Username	Problem	Language	Result	Execution time	Memory
576468		benson1029	Ideal city (IOI12_city)	C++14	32 / 100	154 ms	2072 KiB

city

#include<bits/stdc++.h>
using namespace std;

int mp[2005][2005], vis[2005][2005], dis[2005][2005];
queue< pair<int,int> > q;
int dx[4] = {0, 0, 1, -1};
int dy[4] = {1, -1, 0, 0};
vector<long long> XX, YY;


int DistanceSum(int N, int *X, int *Y) {
	for(int i=0; i<N; i++) {
		XX.push_back(X[i]);
		YY.push_back(Y[i]);
	}
	sort(XX.begin(), XX.end()); sort(YY.begin(), YY.end());
	if(N <= 2000) {
		for(int i=0; i<N; i++) {
			X[i] -= XX[0];
			Y[i] -= YY[0];
		}
		for(int i=0; i<N; i++) {
			mp[X[i]][Y[i]] = 1;
		}
		long long ans = 0;
		for(int i=0; i<N; i++) {
			for(int j=0; j<N; j++) vis[X[j]][Y[j]] = 0;
			vis[X[i]][Y[i]] = 1;
			q.push({X[i], Y[i]});
			dis[X[i]][Y[i]] = 0;
			while(!q.empty()) {
				int x = q.front().first;
				int y = q.front().second;
				ans += dis[x][y];
				q.pop();
				for(int j=0; j<4; j++) {
					if(mp[x+dx[j]][y+dy[j]] == 1 && vis[x+dx[j]][y+dy[j]] == 0) {
						vis[x+dx[j]][y+dy[j]] = 1;
						dis[x+dx[j]][y+dy[j]] = dis[x][y] + 1;
						q.push({x+dx[j], y+dy[j]});
					}
				}
			}
		}
		return (ans/2) % 1000000000;
	} else {
		long long tmp = 0, ans = 0;
		for(int i=0; i<N; i++) {
			ans += XX[i] * i - tmp;
			tmp += XX[i];
		}
		tmp = 0;
		for(int i=0; i<N; i++) {
			ans += YY[i] * i - tmp;
			tmp += YY[i];
		}
		return ans;
	}
}

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