Submission #964626

#	Time	Username	Problem	Language	Result	Execution time	Memory
964626		efedmrlr	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	105 ms	13048 KiB

foehn_phenomena

// #pragma GCC optimize("O3,Ofast,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>

using namespace std;


#define int long long int
#define MP make_pair
#define pb push_back
#define REP(i,n) for(int i = 0; (i) < (n); (i)++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()


void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
}


const double EPS = 0.00001;
const int INF = 1e9+500;
const int N = 3e5+5;
const int ALPH = 26;
const int LGN = 25;
constexpr int MOD = 1e9+7;
int n,q,s,t;
vector<int> d;
int ans = 0;

void upd(int ind, int x) {
    if(d[ind] > 0) {
        ans += s * d[ind];
    }
    else {
        ans += t * d[ind];
    }
    d[ind] += x;
    if(d[ind] > 0) {
        ans -= s * d[ind];
    }
    else {
        ans -= t * d[ind];
    }
}

inline void solve() {
    cin>>n>>q>>s>>t;
    vector<int> a(n + 1);
    REP(i, n + 1) cin >> a[i];
    d.assign(n + 3, 0);
    for(int i = 1; i<=n; i++) {
        d[i] = a[i] - a[i - 1];
        if(d[i] > 0) {
            ans -= s * d[i];
        }
        else {
            ans -= t * d[i];
        }
    }
    REP(z, q) {
        int l, r, x;
        cin >> l >> r >> x;
        if(r + 1 <= n) upd(r + 1, -x);
        upd(l, x);
        cout << ans << "\n";
    }

}
 
signed main() {

    fastio();
    int test = 1;
    //cin>>test;
    while(test--) {
        solve();
    }
    
}

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