Submission #568993

#	Time	Username	Problem	Language	Result	Execution time	Memory
568993		DJ035	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	316 ms	17296 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define MEM 200005
#define sanic ios_base::sync_with_stdio(0)
#define MOD 1000000
#define x first
#define y second
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pi;
const ll INF = 1e13+7;
ll t,n,m,x,y;
ll tree[4*MEM], a[MEM], c[MEM];
ll init(ll pos, ll val, ll idx, ll s, ll e){
    if(s>idx || idx>e) return tree[pos];
    if(s==e) return tree[pos] = val;
    ll mid = (s+e)/2;
    return tree[pos] = init(pos*2, val, idx, s, mid)+init(pos*2+1, val, idx, mid+1, e);
}
ll query(ll nd, ll l, ll r, ll s, ll e){
    if(l>e || s>r) return 0;
    if(l<=s && e<=r) return tree[nd];
    ll mid = (s+e)/2;
    return query(nd*2, l, r, s, mid)+query(nd*2+1, l, r, mid+1, e);
}
int main() {
    sanic; cin.tie(0); cout.tie(0);
    cin >> n >> m >> x >> y;
    for(int i=0; i<=n; i++){
        cin >> a[i];
        if(i) c[i] = a[i-1]-a[i];
    }
    for(int i=1; i<=n; i++)
        init(1, c[i]*(c[i]>0 ? y:x), i, 1, n);
    while(m--){
        ll q1,q2,q3;
        cin >> q1 >> q2 >> q3;
        c[q1] -= q3;
        c[q2+1] += q3;
        init(1, c[q1]*(c[q1]>0 ? y:x), q1, 1, n);
        init(1, c[q2+1]*(c[q2+1]>0 ? y:x), q2+1, 1, n);
        cout << query(1, 1, n, 1, n) <<'\n';
    }
}

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