Submission #232858

#	Time	Username	Problem	Language	Result	Execution time	Memory
232858		nicolaalexandra	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	865 ms	11684 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define DIM 200010
using namespace std;
long long aib[DIM],v[DIM];
int n,q,x,y,i;
long long s,t,val;
void update (int p, long long val){
    for (;p<=n;p+=(p&-p))
        aib[p] += val;
}
long long query (int p){
    if (p <= 0)
        return 0;
    long long sol = 0;
    for (;p;p-=(p&-p))
        sol += aib[p];
    return sol;
}

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n>>q>>s>>t;
    long long sum = 0;
    for (i=0;i<=n;i++){
        cin>>v[i];
        if (!i)
            continue;
        if (v[i-1] < v[i])
            sum -= s * (v[i] - v[i-1]);
        else sum += t * (v[i-1] - v[i]);

        update (i,v[i]);
        update (i+1,-v[i]);
    }

    for (;q--;){
        cin>>x>>y>>val;

        long long nr = query (x-1), nr2 = query (x);
        if (nr < nr2)
            sum += s * (nr2 - nr);
        else sum -= t * (nr - nr2);


        nr = query (y), nr2 = query (y+1);

        if (y < n){
            if (nr < nr2)
                sum += s * (nr2 - nr);
            else sum -= t * (nr - nr2);
        }

        update (x,val);
        update (y+1,-val);


        nr = query (x-1), nr2 = query (x);
        if (nr < nr2)
            sum -= s * (nr2 - nr);
        else sum += t * (nr - nr2);


        nr = query (y), nr2 = query (y+1);

        if (y < n){
            if (nr < nr2)
                sum -= s * (nr2 - nr);
            else sum += t * (nr - nr2);
        }

        cout<<sum<<"\n";
    }


    return 0;
}

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