Submission #51468

#	Time	Username	Problem	Language	Result	Execution time	Memory
51468		combi2k2	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	233 ms	5972 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int   N   = 2e5 + 1;
int a[N], n, q, s, t;
int f(int x)    {
    if(x < 0)   return x * s;
    return x * t;
}
signed main(){
    ios_base::sync_with_stdio(false);   cin.tie(0);
    cin >> n >> q >> s >> t;
    int ans = 0;
    for(int i = 0 ; i <= n ; ++i)   {
        cin >> a[i];
        if(i)   {
            a[i - 1] = a[i - 1] - a[i];
            ans += f(a[i - 1]);
        }
    }
    while(q--)  {
        int l, r, x;
        cin >> l >> r >> x;
        if(l > 0)   {
            ans -= f(a[l - 1]); a[l - 1] -= x;
            ans += f(a[l - 1]);
        }
        if(r < n)   {
            ans -= f(a[r]);     a[r] += x;
            ans += f(a[r]);
        }
        cout << ans << "\n";
    }
}

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