Submission #480923

#	Time	Username	Problem	Language	Result	Execution time	Memory
480923		Lobo	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	173 ms	5616 KiB

foehn_phenomena

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

const long long INFll = (long long) 1e18 + 10;
const int INFii = (int) 1e9 + 10;
typedef long long ll;
typedef int ii;
typedef long double dbl;
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

#define maxn 220000

ll n, q, s, t, bit[maxn];

void att(ll pos, ll val) {
    for(ll i = pos; i <= n && i > 0; i+= i&-i)
        bit[i]+= val;
}

ll qrr(ll pos) {
    ll sum = 0;
    for(ll i = pos; i > 0; i-= i&-i) 
        sum+= bit[i];
    return sum;
}

int main() {
    ios::sync_with_stdio(false); cin.tie(0);

    //freopen("in.in", "r", stdin);
    //freopen("out.out", "w", stdout);

    cin >> n >> q >> s >> t;

    for(ll i = 0; i <= n; i++) {
        ll a; cin >> a;
        att(i,a);
        att(i+1,-a);
    }

    ll up = 0;
    ll dw = 0;

    for(ll i = 1; i <= n; i++) {
        ll l1 = qrr(i-1);
        ll l2 = qrr(i);
        if(l1 < l2) {
            up+= abs(l1-l2);
        }
        else {
            dw+= abs(l1-l2);
        }
    }

    while(q--) {
        ll l, r, x;
        cin >> l >> r >> x;

        ll l1 = qrr(l-1);
        ll l2 = qrr(l);
        if(l1 < l2) {
            up-= abs(l1-l2);
        }
        else {
            dw-= abs(l1-l2);
        }

        ll r1 = qrr(r);
        ll r2 = qrr(r+1);
        if(r1 < r2 && r != n) {
            up-= abs(r1-r2);
        }
        else if(r != n) {
            dw-= abs(r1-r2);
        }

        att(l,x);
        att(r+1,-x);

        l1 = qrr(l-1);
        l2 = qrr(l);
        if(l1 < l2) {
            up+= abs(l1-l2);
        }
        else {
            dw+= abs(l1-l2);
        }

        r1 = qrr(r);
        r2 = qrr(r+1);
        if(r1 < r2 && r != n) {
            up+= abs(r1-r2);
        }
        else if(r != n) {
            dw+= abs(r1-r2);
        }

        cout << dw*t - up*s << endl;
    }
}

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