Submission #339450

#	Time	Username	Problem	Language	Result	Execution time	Memory
339450		bigDuck	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	411 ms	15744 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
#define count_bits __builtin_popcount
#define int ll

int n, q, s, t, a[200010];
int neg=0, pos=0;


int seg[800010];

void lazy(int v){
seg[2*v]+=seg[v]; seg[2*v+1]+=seg[v];
seg[v]=0;
return;
}



void update(int v, int tl, int tr, int l, int r, int x){
    if(l>r){
        return;
    }
    if( (l==tl) && (r==tr) ){
        seg[v]+=x; return;
    }
    lazy(v);
    int mid=(tl+tr)>>1ll;
    update(v*2, tl, mid, l,min(r, mid), x); update(2*v+1, mid+1, tr, max(l, mid+1), r, x);
}



int query(int v, int tl, int tr, int p){

    if(tl==tr){
        return seg[v];
    }

    int mid=(tl+tr)>>1ll;
    lazy(v);
    if(p<=mid){
        return query(2*v, tl, mid, p);
    }
    else{
        return query(2*v+1, mid+1, tr, p);
    }
}





int32_t main(){
INIT
cin>>n>>q>>s>>t;
for(int i=0; i<=n; i++){
    cin>>a[i];
    if(i>0){
        if( (a[i])>a[i-1] ){
            pos+=(a[i]-a[i-1]);
        }
        else{
            neg+=(a[i]-a[i-1]);
        }
    }
}



//cout<<neg<<" "<<pos<<"\n";

while(q--){
    int l, r, x; cin>>l>>r>>x;

    int a1=a1=( (l-1)>0 )?(query(1, 1, n, l-1)+a[l-1]):(0), a2=query(1, 1, n, l)+a[l];
    int a3=query(1, 1, n, r)+a[r], a4=query(1, 1, n, min(r+1, n))+a[min(r+1, n)];
    //cout<<a1<<" "<<a2<<" "<<a3<<" "<<a4<<"\n";
    if( (a2>a1) ){
        pos-=a2-a1;
    }
    else{
        neg-=a2-a1;
    }
    if( (a4>a3) ){
        pos-=a4-a3;
    }
    else{
        neg-=a4-a3;
    }


    update(1, 1, n, l, r, x);
    a1=( (l-1)>0 )?(query(1, 1, n, l-1)+a[l-1]):(0), a2=query(1, 1, n, l)+a[l];
    a3=query(1, 1, n, r)+a[r], a4=query(1, 1, n, min(r+1, n))+a[min(r+1, n)];

    if( (a2>a1) ){
        pos+=a2-a1;
    }
    else{
        neg+=a2-a1;
    }
    if( (a4>a3) ){
        pos+=a4-a3;
    }
    else{
        neg+=a4-a3;
    }
    //cout<<a1<<" "<<a2<<" "<<a3<<" "<<a4<<"\n";
    cout<<(t*(-neg)-s*pos)<<"\n";
}



return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int32_t main()':
foehn_phenomena.cpp:83:14: warning: operation on 'a1' may be undefined [-Wsequence-point]
   83 |     int a1=a1=( (l-1)>0 )?(query(1, 1, n, l-1)+a[l-1]):(0), a2=query(1, 1, n, l)+a[l];
      |            ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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