Submission #979890

#	Time	Username	Problem	Language	Result	Execution time	Memory
979890		pera	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	0 / 100	454 ms	11344 KiB

foehn_phenomena

#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N = 2e5 + 1;
int n , q , S , T , sum = 0;
vector<int> A(N) , t(N);
void add(int u , int x){
   while(u <= n){
      t[u] += x;
      u += u&-u;
   }
}
int get(int u){
   int s = 0;
   while(u > 0){
      s += t[u];
      u -= u&-u;
   }
   return s;
}
main(){
   cin >> n >> q >> S >> T;
   auto value = [&](int i){
      return (A[i] > A[i - 1] ? -S * (A[i] - A[i - 1]) : T * (A[i - 1] - A[i]));
   };
   cin >> A[0];
   for(int i = 1;i <= n;i ++){
      cin >> A[i];
      add(i , A[i]);
      if(i < n){
         add(i + 1 , -A[i]);
      }
      sum += value(i);
   }
   while(q--){
      int l , r , x;
      cin >> l >> r >> x;
      add(l , x);
      if(r + 1 < n){
         add(r + 1 , -x);
      }
      if(r < n){
         sum -= value(r + 1);
         A[r] = get(r);
         A[r + 1] = get(r + 1);
         sum += value(r + 1);
      }
      sum -= value(l);
      A[l] = get(l);
      A[l - 1] = get(l - 1);
      sum += value(l);
      cout << sum << endl;
   }
}

Compilation message (stderr)

foehn_phenomena.cpp:21:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   21 | main(){
      | ^~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60