Submission #1262482

#	Time	Username	Problem	Language	Result	Execution time	Memory
1262482		goulthen	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	61 ms	7888 KiB

foehn_phenomena

//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <class T>
using Tree =
    tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
#define int long long
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define rep(i, a, b) for (int i = a; i <= b; ++i)
#define per(i, b, a) for (int i = b; i >= a; --i)
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(), (v).end()
#define lsb(x) (x)&(-x)
#define bug(x) cerr << #x << " " << x << endl;
 
void setIO(string name = "") {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    if (!name.empty()) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}
 
ll fexp(ll a, ll b, ll m) {
    if (b == 0) return 1LL;
    ll p = a;
    ll ans = 1;
    while (b > 0) {
        if (b % 2 != 0) ans = (ans * p) % m;
        p = (p * p) % m;
        b >>= 1;
    }
    return ans;
}
 
const int MAXN = 2e5 + 10;
const int INF = 1e18 + 5;
const int MOD = 1e9 + 7;
int a[MAXN], b[MAXN];

void solve() {
    int n,q,s,t;cin >> n >> q >> s >> t;
    rep (i,0,n) cin >> a[i];
    rep(i,1,n) b[i] = a[i] - a[i-1];
    int sa = 0, sb = 0;
    rep(i,1,n) {
        if (b[i] > 0) sa+=b[i];
        else sb -= b[i];
    }

    while (q--) {
        int l,r,x;cin >> l >> r >> x;
        if (b[l] > 0) sa -= b[l];
        else sb += b[l];
        if (r<n && b[r+1] > 0) sa -= b[r+1];
        else if (r<n) sb += b[r+1];

        b[l]+=x;
        b[r+1]-=x;

        if (b[l] > 0) sa += b[l];
        else sb -= b[l];
        if (r<n && b[r+1] > 0) sa += b[r+1];
        else if (r<n) sb -= b[r+1];


        //cout << sa << ' ' << sb << '\n';
        cout << sb*t - sa*s << '\n';
    }
}

int32_t main() {
    setIO();
    int tt = 1;
    //cin >> tt;
 
    while (tt-- > 0) solve();
    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'void setIO(std::string)':
foehn_phenomena.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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