Submission #784356

#	Time	Username	Problem	Language	Result	Execution time	Memory
784356		devariaota	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	464 ms	13076 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define ll long long
using namespace std;

int main(){
  ll n,q,s,t;cin>>n>>q>>s>>t;
  ll arr[n+5],sel[n+5];
  // 1 3 2 4 5 1
  // 0 2 0 
  ll sumpo=0;
  ll sumne=0;
  for(int i=0;i<=n;i++){
    cin>>arr[i];
    if(i!=0){
      sel[i]=arr[i]-arr[i-1];
      if(sel[i]>0) sumpo+=sel[i];
      else sumne+=sel[i];
    }
  }
  
  for(int i=1;i<=q;i++){
    ll l,r,x;cin>>l>>r>>x;
    if(sel[l]>0) sumpo-=sel[l];
    else sumne-=sel[l];
    sel[l]=sel[l]+x;
    if(sel[l]>0) sumpo+=sel[l];
    else sumne+=sel[l];
    if(r!=n){
      if(sel[r+1]>0) sumpo-=sel[r+1];
      else sumne-=sel[r+1];
      sel[r+1]=sel[r+1]+-1*x;
      if(sel[r+1]>0) sumpo+=sel[r+1];
      else sumne+=sel[r+1];
    }
    ll ans=sumpo*-1*s+sumne*-1*t;
    cout<<ans<<endl;
  }
}

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