Submission #46641

#	Time	Username	Problem	Language	Result	Execution time	Memory
46641		golub	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	163 ms	7592 KiB

foehn_phenomena

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,sse4")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("unroll-all-loops")

#include <bits/stdc++.h>

//#define TASK "lca"

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define F first
#define S second
#define pb push_back
#define int long long
#define pii pair<int, int>

typedef long long ll;
//typedef long double ld;

using namespace std;

const int INF = 1e18;
const int MAXN = 1e8;
const int MOD = 1e9 + 7;
const double EPS = 1e-12;

//char buf[(int)1e9];
//size_t p_ = 0;
//
//inline void *operator new(size_t n_) {
//    p_ += n_;
//    return buf + p_ - n_;
//}
//inline void operator delete(void*) {};

ll power(ll x, ll n, ll mod = 1e9 + 7) {
    if (n == 0) return 1ll;
    if (n & 1ll) return power(x, n - 1ll, mod) * x % mod;
    ll tmp = power(x, n >> 1ll, mod);
    return (tmp * tmp) % mod;
}

ll gcd(ll a, ll b) {
    if (b == 0) return a;
    return gcd (b, a % b);
}

ll lcm(ll a, ll b) {
    return a / gcd(a, b) * b;
}

signed main() {
#ifndef LOCAL
#ifdef TASK
    freopen(TASK".in", "r", stdin);
    freopen(TASK".out", "w", stdout);
#endif
#endif
#ifdef LOCAL
    //freopen("/Users/alekseygolub/Desktop/с++/ABS/ABS/input.txt", "r", stdin);
#endif
    iostream::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    srand(924653523);
    // == SOLUTION == //
    int n, q, s, t;
    cin >> n >> q >> s >> t;
    vector<int> a(n + 1);
    for (int i = 0; i < n + 1; i++) {
        cin >> a[i];
    }
    vector<int> d(n);
    int ans = 0;
    for (int i = 0; i < n; i++) {
        d[i] = a[i + 1] - a[i];
        if (d[i] > 0) ans -= s * d[i];
        if (d[i] <= 0) ans += abs(t * d[i]);
    }
    //cout << ans << '\n';
    for (int i = 0; i < q; i++) {
        int l, r, x;
        cin >> l >> r >> x;
        l--; r;
        if (l >= 0) {
            if (d[l] > 0) {
                ans += s * d[l];
            } else {
                ans -= abs(t * d[l]);
            }
            d[l] += x;
            if (d[l] > 0) ans -= s * d[l];
            if (d[l] <= 0) ans += abs(t * d[l]);
        }
        if (r < n) {
            if (d[r] > 0) {
                ans += s * d[r];
            } else {
                ans -= abs(t * d[r]);
            }
            d[r] -= x;
            if (d[r] > 0) ans -= s * d[r];
            if (d[r] <= 0) ans += abs(t * d[r]);
        }
//        for (auto aa: d) cout << aa << " ";
//        cout << "\n";
        cout << ans << "\n";
    }
    
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:85:15: warning: statement has no effect [-Wunused-value]
         l--; r;
               ^

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