Submission #950538

#	Time	Username	Problem	Language	Result	Execution time	Memory
950538		xynex	Triple Jump (JOI19_jumps)	C++17	46 / 100	338 ms	213076 KiB

jumps

/**
  * Author: Tenjin
  * Created: 27.04.2022 18:58
  * 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 = 998244353;
const ll INF = 1e14;
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*/

const int N = 1e6 + 5;
const int M = 2e6 + 6;

ll a[N];
int n;
ll z[N];
struct seg {
  class Node {
    public:
    ll mx, last, sum;
    Node() { last = -INF, sum = -INF, mx = 0; }
    Node(int num) { last = -INF, sum = -INF, mx = num; }
  } t[N << 2];
  void build(int tl = 1, int tr = n, int v = 1) {
    if(tl == tr) t[v] = *new Node(a[tl]);
    else {
      int mid = (tl + tr) >> 1;
      build(tl, mid, v * 2);
      build(mid + 1, tr, v * 2 + 1);
      t[v] = *new Node(max(t[v * 2].mx, t[v * 2 + 1].mx));
    }
  }
  void push(int tl, int tr, int v) {
    if(!z[v]) return;
    if(tl != tr) {
      z[v * 2] = max(z[v * 2], z[v]);
      z[v * 2 + 1] = max(z[v * 2 + 1], z[v]);
    }
//    print("P", tl, tr, z[v], t[v].last, t[v].sum, t[v].mx);
    t[v].last = max(t[v].last, z[v]);
    t[v].sum = max(t[v].sum, t[v].last + t[v].mx);
//    print("N", t[v].sum);
    z[v] = 0;
  }
  void upd(int l, int r, ll val, int tl = 1, int tr = n, int v = 1) {
    push(tl, tr, v);
  //  print("T", l, r, val, tl, tr);
    if(tl > r || tr < l) return;
    if(tl >= l && tr <= r) {
      z[v] = max(z[v], val);
      push(tl, tr, v);
      return;
    }
    int mid = (tl + tr) >> 1;
    upd(l, r, val, tl, mid, v * 2), upd(l, r, val, mid + 1, tr, v * 2 + 1);
    t[v].mx = max(t[v * 2].mx, t[v * 2 + 1].mx);
    t[v].sum = max(t[v * 2].sum, t[v * 2 + 1].sum);
  }
  ll get(int l, int r, int tl = 1, int tr = n, int v = 1) {
    push(tl, tr, v);
    if(tl > r || tr < l) return 0;
    if(tl >= l && tr <= r) return t[v].sum;
    int mid = (tl + tr) >> 1;
    return max(get(l, r, tl, mid, v * 2), get(l, r, mid + 1, tr, v * 2 + 1));
  }
} tree;
vt<int> chg[N];
ll ans[N];
vt<pr<int, int>> qu[N];
void solve() {
   read(n);
   for(int i = 1; i <= n; ++i) {
      read(a[i]);
   }
   tree.build();
   vt<int> st;
   for(int i = 1; i <= n; ++i) {
      while(!st.empty() && a[st.back()] <= a[i]) {
        chg[st.back()].pb(i);
        st.pop_back();
      }
      if(!st.empty()) {
        chg[st.back()].pb(i);
      }
      st.push_back(i);
   }
   int q; read(q);
   for(int i = 1; i <= q; ++i) {
      int l, r; read(l, r);
      qu[l].pb({r, i});
   }
   for(int i = n; i >= 1; --i) {
      while(!chg[i].empty()) {
        int j = chg[i].back();
        chg[i].pop_back();
        int x = j - i + j;
//        print("CH", x, n, i, j, a[i] + a[j]);
        if(x <= n) {
          tree.upd(x, n, a[i] + a[j]);
        }
      }
      for(auto cur : qu[i]) {
//        print("Q", i, cur.ff);
        ans[cur.ss] = tree.get(i, cur.ff);
      }
   }
   for(int i = 1; i <= q; ++i) print(ans[i]);
}

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

Compilation message (stderr)

jumps.cpp: In function 'void freop(std::string)':
jumps.cpp:71:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |   freopen((s + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jumps.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 + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 0 / 54