Submission #98218

#	Time	Username	Problem	Language	Result	Execution time	Memory
98218		luciocf	Ideal city (IOI12_city)	C++14	0 / 100	11 ms	908 KiB

city

#include <bits/stdc++.h>

#define x first
#define y second

using namespace std;

const int maxn = 1e5+10;
const long long mod = 1e9;

typedef long long ll;
typedef pair<int, int> pii;

int n;

ll soma[maxn];

pii pt[maxn];

bool comp(pii a, pii b) {return a.y < b.y;}

int DistanceSum(int N, int *X, int *Y)
{
	n = N;
	for (int i = 0; i < n; i++)
		pt[i+1] = {X[i], Y[i]};

	sort(pt+1, pt+n+1);

	for (int i = 1; i <= n; i++)
		soma[i] = (soma[i-1]+(ll)pt[i].x)%mod;

	ll ans = 0LL;

	for (int i = 1; i <= n; i++)
	{
		ll v = (soma[n]-soma[i]+mod)%mod;

		ans = (ans+v)%mod;
		ans = (ans-((n-i)*(ll)pt[i].x)%mod+mod)%mod;

		v = soma[i-1];

		ans = (ans-v+mod)%mod;
		ans = (ans+((i-1)*(ll)pt[i].x)%mod)%mod;
	}

	sort(pt+1, pt+n+1, comp);

	for (int i = 1; i <= n; i++)
		soma[i] = (soma[i-1]+(ll)pt[i].y)%mod;

	for (int i = 1; i <= n; i++)
	{
		ll v = (soma[n]-soma[i]+mod)%mod;

		ans = (ans+v)%mod;
		ans = (ans-(((ll)n-(ll)i)*(ll)pt[i].y)%mod+mod)%mod;

		v = soma[i-1];

		ans = (ans-v+mod)%mod;
		ans = (ans+(((ll)i-1LL)*(ll)pt[i].y)%mod)%mod;
	}

	return ans;
}

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