Submission #260178

#	Time	Username	Problem	Language	Result	Execution time	Memory
260178		sckmd	Vudu (COCI15_vudu)	C++14	42 / 140	339 ms	16096 KiB

vudu

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
#define MAXN 1000005
ll a[MAXN];
int bit[MAXN];
map <ll,int> mp;

void update(int idx,int val)
{
  while(idx < MAXN)
  {
    bit[idx] += val;
    idx += idx&(-idx);
  }
}
ll get(int idx)
{
  ll ret = 0LL;
  while(idx > 0)
  {
    ret += bit[idx];
    idx -= idx&(-idx);
  }
  return ret;
}
ll get(int l,int r)
{
  ll ret = get(r);
  if(l > 0)ret -= get(l-1);
  return ret;
}
vector <int> all;
int main()
{
  ios_base::sync_with_stdio(false);
  int n;
  cin >> n;
  for(int i = 1; i <= n; i++)cin >> a[i];
  int p;
  cin >> p;
  for(int i = 1; i <= n; i++)a[i]-=p,a[i]+=a[i-1];
  all.push_back(0);
  for(int i = 1; i <= n; i++)all.push_back(a[i]);
  sort(all.begin(),all.end());
  all.erase(unique(all.begin(),all.end()),all.end());
  int ze = -1;
  for(int i = 0; i < all.size(); i++)if(all[i]==0){ze=i;break;}
  update(ze+1,1);
  ll ans = 0LL;
  for(int i = 1; i <= n; i++)
  {
    int idx = lower_bound(all.begin(),all.end(),a[i])-all.begin()+1;
    ans += 1LL*get(idx);
    update(idx,1);
  }
  cout << ans;
  return 0;
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:49:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < all.size(); i++)if(all[i]==0){ze=i;break;}
                  ~~^~~~~~~~~~~~

• Subtask 1: 42 / 140