Submission #104429

#	Time	Username	Problem	Language	Result	Execution time	Memory
104429		wilwxk	Ideal city (IOI12_city)	C++11	23 / 100	43 ms	3576 KiB

city

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

const int MAXN=1e5+5;
const int MOD=1e9;
ll px[MAXN], py[MAXN];

int DistanceSum(int n, int *x, int *y) {
	sort(x, x+n); for(int i=0; i<n; i++) px[i]= x[i] + (i==0 ? 0 : px[i-1]);
	sort(y, y+n); for(int i=0; i<n; i++) py[i]= y[i] + (i==0 ? 0 : py[i-1]);

	ll resp=0;
	for(int i=0; i<n; i++) {
		ll aa=x[i]; aa*=i; aa-=(i==0 ? 0 : px[i-1]);
		ll bb=y[i]; bb*=i; bb-=(i==0 ? 0 : py[i-1]);
		resp+=aa; resp+=bb;
		resp%=MOD;
	}

	return resp;
}

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