Submission #1016285

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016285		dpsaveslives	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	82 ms	13180 KiB

foehn_phenomena

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

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int N,Q; ll S,T; cin >> N >> Q >> S >> T;
    vector<ll> A(N+1),diff(N+1,0);
    for(int i = 0;i<=N;++i){
        cin >> A[i];
        if(i != 0){
            diff[i] = A[i]-A[i-1];
        }
    }
    ll ans = 0;
    for(int i = 1;i<=N;++i){
        if(diff[i] > 0){
            ans -= S*diff[i];
        }
        else{
            ans -= T*diff[i];
        }
    }
    while(Q--){
        int l,r; ll x; cin >> l >> r >> x;
        if(diff[l] > 0){
            ans += S*diff[l];
        }
        else{
            ans += T*diff[l];
        }
        diff[l] += x;
        if(diff[l] > 0){
            ans -= S*diff[l];
        }
        else{
            ans -= T*diff[l];
        }
        if(r+1 <= N){
            if(diff[r+1] > 0){
                ans += S*diff[r+1];
            }
            else{
                ans += T*diff[r+1];
            }
            diff[r+1] -= x;
            if(diff[r+1] > 0){
                ans -= S*diff[r+1];
            }
            else{
                ans -= T*diff[r+1];
            }
        }
        cout << ans << "\n";
    }
    return 0;
}

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