Submission #367641

#	Time	Username	Problem	Language	Result	Execution time	Memory
367641		shafinalam	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	787 ms	13172 KiB

foehn_phenomena

#include "bits/stdc++.h"

using namespace std;
typedef long long ll;
const int mxn = 2e5+5;

ll arr[mxn];
ll diff[mxn];

int main()
{
    ll n, q, S, T;
    cin >> n >> q >> S >> T;

    for(int i = 0; i <= n; i++) {
        cin >> arr[i];        
    }
    ll ans = 0;
    for(int i = 1; i <= n; i++) {
        ll d = arr[i]-arr[i-1];
        diff[i] = d;
        if(d>0) {
            ans-=(abs(d)*S);
        }
        else {
            ans+=(abs(d)*T);
        }
        //cout << ans << '\n';
    }
    //cout << ans << '\n';
    while(q--) {
        ll l, r, x;
        cin >> l >> r >> x;

        if(diff[l]>0) ans += (abs(diff[l])*S);
        else ans -= (abs(diff[l])*T);
        diff[l]+=x;

        if(diff[l]>0) ans -= (abs(diff[l])*S);
        else ans += (abs(diff[l])*T);

        if(r+1<=n) {
            if(diff[r+1]>0) ans += (abs(diff[r+1])*S);
            else ans -= (abs(diff[r+1])*T);
            diff[r+1]-=x;

            if(diff[r+1]>0) ans -= (abs(diff[r+1])*S);
            else ans += (abs(diff[r+1])*T);
        }
        cout << ans << '\n';
    }
    return 0;
}

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