Submission #129324

#	Time	Username	Problem	Language	Result	Execution time	Memory
129324		trinhhung	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	148 ms	7304 KiB

foehn_phenomena

#include<bits/stdc++.h>

using namespace std;

#define int long long

const int N = 2e5 + 5;
int n, s, t, q, ans = 0;
int a[N], f[N];

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> q >> s >> t;
    for(int i = 0; i <= n; ++ i) cin >> a[i];
    for(int i = 1; i <= n; ++ i){
        f[i] = a[i] - a[i-1];
        if(f[i] > 0) ans = ans - f[i] * s;
        else ans = ans - f[i] * t;
    }
    while(q --){
        int l, r, x;
        cin >> l >> r >> x;
        if(f[l] > 0) ans += f[l] * s;
        else ans += f[l] * t;
        f[l] += x;
        if(f[l] > 0) ans -= f[l] * s;
        else ans -= f[l] * t;
        if(r >= n){
            cout << ans << '\n';
            continue;
        }
        if(f[r + 1] > 0) ans += f[r + 1] * s;
        else ans += f[r + 1] * t;
        f[r + 1] -= x;
        if(f[r + 1] > 0) ans -= f[r + 1] * s;
        else ans -= f[r + 1] * t;
        cout << ans << '\n';
     }

}

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