Submission #1212152

#	Time	Username	Problem	Language	Result	Execution time	Memory
1212152		biank	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	90 ms	5704 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

#define forn(i,n) for(int i=0;i<int(n);i++)
#define forsn(i,s,n) for(int i=int(s);i<int(n);i++)
#define dforn(i,n) for(int i=int(n)-1;i>=0;i--)
#define dforsn(i,s,n) for(int i=int(n)-1;i>=int(s);i--)
#define fst first
#define snd second
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()

typedef long long ll;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef pair<int,int> ii;

const int N=2e5+9;

ll ft[N];

void upd(int p, ll v){
    for(++p;p<N;p+=p&-p) ft[p]+=v;
}

void upd(int l, int r, ll v){
    upd(l,v);
    upd(r+1,-v);
}

ll query(int p){
    ll s=0;
    for(++p;p>0;p-=p&-p) s+=ft[p];
    return s;
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    int n,q; ll s,t;
    cin>>n>>q>>s>>t;
    forn(i,n+1){
        int a; cin>>a;
        upd(i,i,a);
    }
    ll ret=0LL;
    auto delta=[&](int i){
        if(i==n) return 0LL;
        ll a=query(i);
        ll b=query(i+1);
        if(a<b) return s*(a-b);
        return t*(a-b);
    };
    forn(i,n) ret+=delta(i);
    forn(i,q){
        int l,r,x;
        cin>>l>>r>>x;
        ret-=delta(l-1);
        ret-=delta(r);
        upd(l,r,x);
        ret+=delta(l-1);
        ret+=delta(r);
        cout<<ret<<'\n';
    }
    
    return 0;
}

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