Submission #422335

#	Time	Username	Problem	Language	Result	Execution time	Memory
422335		jlallas384	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	772 ms	11480 KiB

foehn_phenomena

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

struct FT{
    vector<ll> ft;
    int n;
    FT(int n) : n(n),ft(n+1){};
    void upd(int idx,int val){
        for(; idx <= n; idx += idx & -idx){
            ft[idx] += val;
        }
    }
    ll qry(int idx){
        ll sum = 0;
        for(; idx > 0; idx -= idx & -idx){
            sum += ft[idx];
        }
        return sum;        
    }
};

int main(){
    int n,q,s,t;
    cin >> n >> q >> s >> t;
    auto f = [&](ll a,ll b){
        if(a < b) return (b - a) * s * -1;
        return (a - b) * t;
    };
    FT ft(n);
    int prv = 0;
    ll ans = 0;
    for(int i = 0; i <= n; i++){
        int x;
        cin >> x;
        if(i){
            ans += f(prv,x);
            ft.upd(i,x);
            ft.upd(i + 1,-x);
        }
        prv = x;
    }
    while(q--){
        int l,r,x;
        cin >> l >> r >> x;
        ans -= f(ft.qry(l-1),ft.qry(l));
        if(r != n){
            ans -= f(ft.qry(r),ft.qry(r+1));
        }
        ft.upd(l,x);
        ft.upd(r + 1,-x);
        ans += f(ft.qry(l-1),ft.qry(l));
        if(r != n){
            ans += f(ft.qry(r),ft.qry(r+1));
        }
        cout << ans << '\n';
    }
}

Compilation message (stderr)

foehn_phenomena.cpp: In constructor 'FT::FT(int)':
foehn_phenomena.cpp:7:9: warning: 'FT::n' will be initialized after [-Wreorder]
    7 |     int n;
      |         ^
foehn_phenomena.cpp:6:16: warning:   'std::vector<long long int> FT::ft' [-Wreorder]
    6 |     vector<ll> ft;
      |                ^~
foehn_phenomena.cpp:8:5: warning:   when initialized here [-Wreorder]
    8 |     FT(int n) : n(n),ft(n+1){};
      |     ^~

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