Submission #129325

#	Time	Username	Problem	Language	Result	Execution time	Memory
129325		trinhhung	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	30 / 100	266 ms	9204 KiB

foehn_phenomena

#include<bits/stdc++.h>
 
using namespace std;
 
#define int long long
 
const int N = 2e5 + 5;
int n, s, t, q;
int a[N], node[4 * N], p[N];
 
void build_tree(int i, int l, int r){
    if(l > r) return;
    if(l == r){
        p[i] = node[i] = a[l - 1ll] - a[l];
        if(node[i] < 0ll) node[i] *= t;
        else node[i] *= s;
        return;
    }
    int mid = (l + r) / 2ll;
    build_tree(i * 2ll, l, mid);
    build_tree(i * 2ll + 1ll, mid + 1ll, r);
    node[i] = node[i * 2ll] + node[i * 2ll + 1ll];
}
 
void update_2(int i, int l, int r, int pos, int val){
    if(l > r || l > pos || r < pos) return;
    if(l == r){
        if(l == pos) {
            p[i] -= val;
            if(p[i] < 0ll) node[i] = p[i] * t;
            else node[i] = p[i] * s;
        }
        return;
    }
    int mid = (l + r) / 2ll;
    update_2(i * 2ll, l, mid, pos, val);
    update_2(i * 2ll + 1ll, mid + 1ll, r, pos, val);
    node[i] = node[i * 2ll] + node[i * 2ll + 1ll];
}
 
void update(int i, int l, int r, int pos, int val){
    if(l > r || l > pos || r < pos) return;
    if(l == r){
        if(l == pos) {
            p[i] += val;
            if(p[i] < 0ll) node[i] = p[i] * t;
            else node[i] = p[i] * s;
        }
        return;
    }
    int mid = (l + r) / 2ll;
    update(i * 2ll, l, mid, pos, val);
    update(i * 2ll + 1ll, mid + 1ll, r, pos, val);
    node[i] = node[i * 2ll] + node[i * 2ll + 1ll];
}
 
 
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> q >> t >> s;
    for(int i = 0; i <= n; ++ i) cin >> a[i];
    build_tree(1, 1, n);
    while(q --){
        int l, r, x;
        cin >> l >> r >> x;
        update_2(1, 1, n, l, x);
        update(1, 1, n, r + 1, x);
        cout << node[1] << '\n';
    }
}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60