Submission #855722

#	Time	Username	Problem	Language	Result	Execution time	Memory
855722		annabeth9680	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	80 ms	13136 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define int long long
using namespace std;
int32_t main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int N,Q,S,T; cin >> N >> Q >> S >> T;
    vector<int> arr(N+1),diff(N+1);
    cin >> arr[0];
    for(int i = 1;i<=N;++i){
        cin >> arr[i];
        diff[i] = arr[i]-arr[i-1];
    }
    int ans = 0;
    for(int i = 1;i<=N;++i){
        if(diff[i] > 0) ans -= diff[i]*S;
        else ans -= diff[i]*T;
    }
    //cout << ans << "\n";
    while(Q--){
        int l,r,x; cin >> l >> r >> x;
        if(diff[l] > 0) ans += diff[l]*S;
        else ans += diff[l]*T;
        diff[l] += x;
        if(diff[l] > 0) ans -= diff[l]*S;
        else ans -= diff[l]*T;
        //cout << ans << "\n";
        if(r < N){
            if(diff[r+1] > 0) ans += diff[r+1]*S;
            else ans += diff[r+1]*T;
            diff[r+1] -= x;
            if(diff[r+1] > 0) ans -= diff[r+1]*S;
            else ans -= diff[r+1]*T;
        }
        cout << ans << "\n";
    }
    return 0;
}

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