Submission #634387

#	Time	Username	Problem	Language	Result	Execution time	Memory
634387		xynex	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	414 ms	19804 KiB

foehn_phenomena

/**
  * Author: Tenjin
  * Created: 19.08.2022 01:29
  * Why am I so stupid? :c
  * Slishkom slab
**/

#include <bits/stdc++.h>

 #pragma GCC optimize("inline")
 #pragma GCC optimize("-fgcse,-fgcse-lm")
 #pragma GCC optimize("-ftree-pre,-ftree-vrp")
 #pragma GCC optimize("-ffast-math")
 #pragma GCC optimize("-fipa-sra")
 #pragma GCC optimize("-fpeephole2")
 #pragma GCC optimize("-fsched-spec")
 #pragma GCC optimize("Ofast,no-stack-protector")
 #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
 #pragma GCC optimize("unroll-loops")

using namespace std;

#define ll long long
#define dl double long
#define ull unsigned long long
#define pr pair
#define vt vector
#define ff first
#define ss second
#define mp make_pair
#define sz(a) (int)a.size()
#define pb push_back
#define pf push_front
#define popB pop_back
#define popF pop_front
#define bit_count __builtin_popcount
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sp(x) fixed << setprecision(x)

template<typename T> T get_rand(T l, T r) {
  random_device rd;
  mt19937 gen(rd());
  return uniform_int_distribution<T>(l, r)(gen);
}
template<typename T> T lcm(T a, T b) { return a * (b / __gcd(a, b)); }

template<class A> void read(vt<A>& v);
template<class A, size_t S> void read(array<A, S>& a);
template<class T> void read(T& x) { cin >> x; }
void read(double& d) { string t; read(t); d = stod(t); }
void read(long double& d) { string t; read(t); d = stold(t); }
template<class H, class... T> void read(H& h, T&... t) { read(h); read(t...); }
template<class A> void read(vt<A>& x) { for (auto& a : x) read(a); }
template<class A, size_t S> void read(array<A, S>& x) { for (auto& a : x) read(a); }

string to_string(char c) { return string(1, c); }
string to_string(bool b) { return b ? "true" : "false"; }
string to_string(const char* s) { return string(s); }
string to_string(string s) { return s; }
string to_string(vt<bool> v) { string res; for (int i = 0; i < sz(v); ++i) res += char('0' + v[i]); return res; }
template<size_t S> string to_string(bitset<S> b) { string res; for (int i = 0; i < S; ++i) res += char('0' + b[i]); return res; }
template<class T> string to_string(T v) { bool f = 1; string res; for (auto x : v) { if (!f) res += ' '; f = 0; res += to_string(x); } return res; }

template<class A> void write(A x) { cout << to_string(x); }
template<class H, class... T> void write(const H& h, const T&... t) { write(h); write(t...); }

void print() { write("\n"); }
template<class H, class... T> void print(const H& h, const T&... t) { write(h); if (sizeof...(t)) write(' '); print(t...); }

void freop(string s) {
  freopen((s + ".in").c_str(), "r", stdin);
  freopen((s + ".out").c_str(), "w", stdout);
}

const int MOD = 1e9 + 7;
const int N1 = 1e6 + 5;
const ll INF = 9e18;
const int M = 3e3 + 5;
const dl pi = acos(-1);
const dl eps = 1e-12;
const int sq = 700;

int dx[] = {-1, 0, 1, 0};
int dy[] = {0, -1, 0, 1};
/* ll vs int*/

ll A[N1], N;
ll t[N1], z[N1];
void build(int tl = 0, int tr = N, int v = 1) {
  if(tl == tr) {
    t[v] = A[tl];
    return;
  }
  int mid = (tl + tr) >> 1;
  build(tl, mid, v * 2); build(mid + 1, tr, v * 2 + 1);
  t[v] = t[v * 2] + t[v * 2 + 1];
}
void push(int tl, int tr, int v) {
  if(tl != tr) {
    z[v * 2] += z[v];
    z[v * 2 + 1] += z[v];
  }
  t[v] += (tr - tl + 1) * z[v];
  z[v] = 0;
}
void upd(int l, int r, int ind, int tl = 0, int tr = N, int v = 1) {
  push(tl, tr, v);
  if(tl > r || tr < l) return;
  if(tl >= l && tr <= r) {
    z[v] += ind;
    push(tl, tr, v);
    return;
  }
  int mid = (tl + tr) >> 1;
  upd(l, r, ind, tl, mid, v * 2); upd(l, r, ind, mid + 1, tr, v * 2 + 1);
  t[v] = t[v * 2] + t[v * 2 + 1];
}
ll get(int pos, int tl = 0, int tr = N, int v = 1) {
  push(tl, tr, v);
  if(tl == tr) return t[v];
  int mid = (tl + tr) >> 1;
  if(mid >= pos) return get(pos, tl, mid, v * 2);
  else return get(pos, mid + 1, tr, v * 2 + 1);
}
void solve() {
  ll Q, S, T; read(N, Q, S, T);
  for(int i = 0; i <= N; ++i) read(A[i]);
  ll ans = 0;
  for(int i = 1; i <= N; ++i) {
    if(A[i] >= A[i - 1]) ans -= S * (A[i] - A[i - 1]);
    else ans += T * (A[i - 1] - A[i]);
  }
  build();
  while(Q--) {
    ll l, r, X; read(l, r, X);
    A[l] = get(l);
    A[l - 1] = get(l - 1);
    A[r] = get(r);
    if(r < N) A[r + 1] = get(r + 1);
    if(A[l] >= A[l - 1]) ans += S * (A[l] - A[l - 1]);
    else ans -= T * (A[l - 1] - A[l]);
    if(r < N) {
      if(A[r + 1] >= A[r]) ans += S * (A[r + 1] - A[r]);
      else ans -= T * (A[r] - A[r + 1]);
    }
    upd(l, r, X);
    A[l] = get(l);
    A[l - 1] = get(l - 1);
    A[r] = get(r);
    if(r < N) A[r + 1] = get(r + 1);
    if(A[l] >= A[l - 1]) ans -= S * (A[l] - A[l - 1]);
    else ans += T * (A[l - 1] - A[l]);
    if(r < N) {
      if(A[r + 1] >= A[r]) ans -= S * (A[r + 1] - A[r]);
      else ans += T * (A[r] - A[r + 1]);
    }
    print(ans);
  }
}

int main() {
  //freop("");
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t = 1;
 // read(t);
  for (int i = 1; i <= t; ++i) {
    //write("Case #" + to_string(i) + ": ");
    solve();
  }
  return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'void freop(std::string)':
foehn_phenomena.cpp:72:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |   freopen((s + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:73:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   freopen((s + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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