Submission #219229

#	Time	Username	Problem	Language	Result	Execution time	Memory
219229		gabrc52	Vudu (COCI15_vudu)	C++14	140 / 140	504 ms	43360 KiB

vudu

#include <iostream>
#include <cassert>
#include <algorithm>

using namespace std;
typedef long long ll;

const int MAXN=1e6;
int N;
int arr[MAXN];
int P;
ll ac[MAXN];
ll sum[MAXN];
ll dif[MAXN];
ll sorted[MAXN];
ll than;
ll ans;
ll ft[MAXN];

void inc(int i) {
	for (; i < N; i |= i+1) ++ft[i];
}

int get(int i) {
	int r = 0;
	for (; i >= 0; i = (i&(i+1)) - 1) r += ft[i];
	return r;
}

void remove(ll val) {
	int lb = lower_bound(sorted,sorted+N,val) - sorted;
	inc(lb);
}

int countLowerOrEqual(ll val) {
	int ub = upper_bound(sorted,sorted+N,val) - sorted;
	return ub - get(ub-1);
	return 0;
}

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin>>N;
	for (int i=0; i<N; i++) {
		cin>>arr[i];
	}
	cin>>P;
	ac[0] = arr[0];
	for (int i=1; i<N; i++) {
		ac[i] = arr[i] + ac[i-1];
	}
	sum[0] = P;
	sorted[0] = dif[0] = sum[0] - ac[0];
	for (int i=1; i<=N; i++) {
		sum[i] = sum[i-1] + P;
		sorted[i] = dif[i] = sum[i] - ac[i];
	}
	sort(sorted, sorted+N);
	than = 0;
	ans += countLowerOrEqual(0);
	for (int i=1; i<N; i++) {
		remove(dif[i-1]);
		than += P - arr[i-1];
		ans += countLowerOrEqual(than);
	}
	cout<<ans<<'\n';
}

• Subtask 1: 140 / 140