Submission #837742

#	Time	Username	Problem	Language	Result	Execution time	Memory
837742		Andrey	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	86 ms	8012 KiB

foehn_phenomena

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

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    long long n,ans = 0,q,s,t,l,r,k;
    cin >> n >> q >> s >> t;
    vector<long long> haha(n+1);
    vector<long long> br(n);
    for(long long i = 0; i <= n; i++) {
        cin >> haha[i];
    }
    for(long long i = 0; i < n; i++) {
        br[i] = haha[i]-haha[i+1];
        if(br[i] > 0) {
            ans+=t*br[i];
        }
        else {
            ans+=s*br[i];
        }
    }
    for(long long i = 0; i < q; i++) {
        cin >> l >> r >> k;
        l--;
        if(br[l] > 0) {
            ans-=t*br[l];
        }
        else {
            ans-=s*br[l];
        }
        br[l]-=k;
        if(br[l] > 0) {
            ans+=t*br[l];
        }
        else {
            ans+=s*br[l];
        }
        if(r < n) {
            if(br[r] > 0) {
                ans-=t*br[r];
            }
            else {
                ans-=s*br[r];
            }
            br[r]+=k;
            if(br[r] > 0) {
                ans+=t*br[r];
            }
            else {
                ans+=s*br[r];
            }
        }
        cout << ans << "\n";
    }
    return 0;
}

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