Submission #946672

#	Time	Username	Problem	Language	Result	Execution time	Memory
946672		NourWael	Vudu (COCI15_vudu)	C++17	140 / 140	417 ms	46768 KiB

vudu

#include <bits/extc++.h>
using namespace std; 
int const mxN = 1e6+1;
long long a[mxN + 1];
int seg[4*mxN];
int val[mxN+1];

int get ( int node, int l, int r, int ind) {
   if(ind<l) return 0;
   if(r-1<=ind) return seg[node];
   int m = (l+r) / 2;
   return get(node*2+1, l, m, ind) + get(node*2+2, m, r, ind);
}

void update ( int node, int l, int r, int ind) {
    if(ind<l || ind>=r) return;
    if(l==r-1 && l==ind) {
      seg[node] += 1;
      return;
    }
    int m = (l+r) / 2;
    update(node*2+1, l, m, ind), update(node*2+2, m, r, ind);
    seg[node] = seg[node*2+1] + seg[node*2+2];
}

signed main() {
   ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
   
   long long n,p, ans = 0, ind = 0; cin>>n;
   for(int i=0; i<n; i++) cin>>a[i];
   cin>>p;
   vector<pair<long long,int>> st;
   st.push_back({p,n});
   for(int i=0; i<n; i++) {
      a[i] += (i? a[i-1]:0);
      long long x = a[i] - p*i;
      st.push_back({x,i});
   }
   sort(st.begin(),st.end());
   val[st[0].second] = 0;
   for(int i=1; i<st.size(); i++) {
      if(st[i].first==st[i-1].first) { val[st[i].second] = val[st[i-1].second]; continue; }
      ind++;
      val[st[i].second] = ind;
   }
   st.clear();
   int pw = (1<<(__lg(ind-1)+1));
   update(0,0,pw, val[n]);
   for(int i=0; i<n; i++) {
      long long x = val[i];
      ans += get(0,0,pw, x);
      update(0,0,pw,x);
   }
   cout<<ans;
   return 0;
}

Compilation message (stderr)

vudu.cpp: In function 'int main()':
vudu.cpp:41:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |    for(int i=1; i<st.size(); i++) {
      |                 ~^~~~~~~~~~

• Subtask 1: 140 / 140