Submission #783722

#	Time	Username	Problem	Language	Result	Execution time	Memory
783722		kebine	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	84 ms	7256 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define fi first
#define se second
#define pb push_back
#define TC int t; cin>>t; while(t--)
#define all(x) (x).begin(),(x).end()
//*AC BERSAMA ALLAH  FORTIS FORTUNA ADIUVAT

ll n,q,s,t;
vector<ll> v, dif;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin>>n>>q>>s>>t;
    v.resize(n+5);
    dif.resize(n+5);

    ll sneg=0, spos=0, val=0; // stored in positive
    for(int i=0;i<=n;i++){
        cin>>v[i];
        if(i>0){
            dif[i] = v[i]-v[i-1];
            if(dif[i]<=0) sneg += (dif[i]*-1);
            else spos += dif[i];
        }
    }

    // val = sneg * t - spos * s;
    // cout<<"::"<<spos<<"--"<<sneg<<'\n';
    // cout<<"=="<<val<<'\n';

    for(int i=1;i<=q;i++){
        ll l,r,x;
        cin>>l>>r>>x;
        
        if(dif[l]<=0) sneg += dif[l];
        else spos -= dif[l];

        if(r==n);
        else if(dif[r+1]<=0) sneg += dif[r+1];
        else spos -= dif[r+1];
        // cout<<"::"<<spos<<"--"<<sneg<<'\n';

        dif[l] += x;
        dif[r+1] -= x;
        if(dif[l]<=0) sneg -= dif[l];
        else spos += dif[l];

        if(r==n);
        else if(dif[r+1]<=0) sneg -= dif[r+1];
        else spos += dif[r+1];
        // cout<<"::"<<spos<<"--"<<sneg<<'\n';

        val = sneg * t - spos * s;
        cout<<val<<'\n';
        // cout<<val<<'\n';
    }

    return 0;
}

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