Submission #87415

#	Time	Username	Problem	Language	Result	Execution time	Memory
87415		nikolapesic2802	Vudu (COCI15_vudu)	C++14	140 / 140	393 ms	36248 KiB

vudu

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>

#define ll long long
#define pb push_back
#define sz(x) (int)(x).size()
#define mp make_pair
#define f first
#define s second
#define all(x) x.begin(), x.end()

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>; ///find_by_order(),order_of_key()
template<class T1, class T2> ostream& operator<<(ostream& os, const pair<T1,T2>& a) { os << '{' << a.f << ", " << a.s << '}'; return os; }
template<class T> ostream& operator<<(ostream& os, const vector<T>& a) {
	os << '{';
	for(int i=0;i<sz(a);i++)
	{
		if(i>0&&i<sz(a)-1)
			os << ", ";
		os << a[i];
	}
	os << '}';
    return os;
}
const int N=1e6+5;
vector<ll> pre(N);
vector<int> fen(N),mapa(N);
void update(int i){
    for(;i<N;i+=i&(-i))
        fen[i]++;
}
int get(int i){
    int sum=0;
    for(;i;i-=i&(-i))
        sum+=fen[i];
    return sum;
}
int main()
{
    int n,p;
    scanf("%i",&n);
    for(int i=1;i<=n;i++)
        scanf("%lld",&pre[i]);
    scanf("%i",&p);
    vector<pair<ll,int> > poz;
    for(int i=1;i<=n;i++)
    {
        pre[i]+=pre[i-1]-p;
        poz.pb({pre[i],i});
    }
    poz.pb({0,0});
    sort(poz.begin(),poz.end());
    for(int i=0;i<=n;i++)
        mapa[poz[i].second]=i+1;
    ll ans=0;
    update(mapa[0]);
    for(int i=1;i<=n;i++)
    {
        ans+=get(mapa[i]);
        update(mapa[i]);
    }
    printf("%lld\n",ans);
    return 0;
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i",&n);
     ~~~~~^~~~~~~~~
vudu.cpp:49:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld",&pre[i]);
         ~~~~~^~~~~~~~~~~~~~~~
vudu.cpp:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i",&p);
     ~~~~~^~~~~~~~~

• Subtask 1: 140 / 140