Submission #718444

#	Time	Username	Problem	Language	Result	Execution time	Memory
718444		arush_agu	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	160 ms	15872 KiB

foehn_phenomena

#include <algorithm>
#include <cctype>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

#ifdef DEBUG
#include <time.h>
#endif

#define all(a) (a).begin(), (a).end()
#define rev(a) (a).rbegin(), (a).rend()
#define F first
#define S second
int recur_depth = 0;
#ifdef DEBUG
#define dbg(x)                                                                 \
  {                                                                            \
    ++recur_depth;                                                             \
    auto x_ = x;                                                               \
    --recur_depth;                                                             \
    cerr << string(recur_depth, '\t') << "\e[91m" << __func__ << ":"           \
         << __LINE__ << "\t" << #x << " = " << x_ << "\e[39m" << endl;         \
  }
#else
#define dbg(x)
#endif

using namespace std;
using namespace __gnu_pbds;

typedef pair<int, int> ii;

typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> llll;

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pair<int, int>> vii;
typedef vector<vii> vvii;

typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<pair<ll, ll>> vll;
typedef vector<vll> vvll;

typedef vector<bool> vb;

template <class type1>
using ordered_set = tree<type1, null_type, less<type1>, rb_tree_tag,
                         tree_order_statistics_node_update>;

template <typename A, typename B>
ostream &operator<<(ostream &os, const pair<A, B> &p) {
  return os << '(' << p.first << ", " << p.second << ')';
}
template <typename T_container, typename T = typename enable_if<
                                    !is_same<T_container, string>::value,
                                    typename T_container::value_type>::type>
ostream &operator<<(ostream &os, const T_container &v) {
  os << '{';
  string sep;
  for (const T &x : v)
    os << sep << x, sep = ", ";
  return os << '}';
}

const ll MOD = 1e9 + 7;
// const ll MOD = 998244353;
const ll INF = 1e9;
const ld EPS = 1e-9;

struct FT {
  int n;
  vl t;

  void init(int n_) {
    n = n_;
    t = vl(n + 1);
  }

  void upd(int idx, ll v) {
    for (idx++; idx<=n; idx += idx & -idx)
      t[idx] += v;
  }

  ll query(int idx) {
    ll res = 0;
    for (idx++; idx>0; idx -= idx & -idx)
      res += t[idx];
    return res;
  }

  void upd(int l, int r, ll v) {
    upd(l, v); upd(r + 1, -v);
  }
} ft1, ft2;

void solve() {
  ll n, q, s, t; cin >> n >> q >> s >> t;
  vl h(n + 1); for (ll &x : h) cin >> x;

  ft1.init(n + 2); ft2.init(n + 2);
  for (int i=0; i<=n; i++) ft1.upd(i, i, h[i]);

  vl temp(n + 1); for (int i=1; i<=n; i++) {
    if (h[i - 1] < h[i]) temp[i] = temp[i - 1] - (h[i] - h[i - 1]) * s;
    else temp[i] = temp[i - 1] + (h[i - 1] - h[i]) * t;
    ft2.upd(i, i, temp[i]);
  }

  auto increase = [&](int idx, ll v) {
    ll ph = ft1.query(idx - 1), ch = ft1.query(idx);
    ft1.upd(idx, n, v);
    if (ph <= ch) {
      ft2.upd(idx, n, -v * s);
      return;
    }

    ll fv = ph - ch;
    if (v < fv) {
      ft2.upd(idx, -v * t);
      return;
    }

    ft2.upd(idx, n, -fv * t);
    ft2.upd(idx, n, -(v - fv) * s);
  };

  auto decrease = [&](int idx, ll v) {
    ll ph = ft1.query(idx - 1), ch = ft1.query(idx);
    ft1.upd(idx, n, -v);
    if (ph >= ch) {
      ft2.upd(idx, n, v * t);
      return;
    }

    ll fv = ch - ph;
    if (v < fv) {
      ft2.upd(idx, v * s);
      return;
    }

    ft2.upd(idx, n, fv * s);
    ft2.upd(idx, n, (v - fv) * t);
  };

  while (q--) {
    int l, r; ll d; cin >> l >> r >> d;
    if (d == 0) {
      cout << ft2.query(n) << "\n";
      continue;
    }

    // cerr << "L: " << l << " R: " << r << " D: " << d << "\n";
    // cerr << "\tH: {"; for (int i=0; i<=n; i++) cerr << ft1.query(i) << ","; cerr << "}\n";
    // cerr << "\tT: {"; for (int i=0; i<=n; i++) cerr << ft2.query(i) << ","; cerr << "}\n";

    if (d > 0) {
      increase(l, d);
      decrease(r + 1, d);
    } else {
      decrease(l, -d);
      increase(r + 1, -d);
    }

    // cerr << "\tNH: {"; for (int i=0; i<=n; i++) cerr << ft1.query(i) << ","; cerr << "}\n";
    // cerr << "\tNT: {"; for (int i=0; i<=n; i++) cerr << ft2.query(i) << ","; cerr << "}\n";
    cout << ft2.query(n) << "\n";
  }
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);

  clock_t start = clock();

  int test_cases = 1;
  /* cin >> test_cases; */

  while (test_cases--)
    solve();

#ifdef DEBUG
  cerr << fixed << setprecision(10)
       << "\nTime Taken: " << (double)(clock() - start) / CLOCKS_PER_SEC
       << "s\n";
#endif
  return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:195:11: warning: unused variable 'start' [-Wunused-variable]
  195 |   clock_t start = clock();
      |           ^~~~~

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