Submission #600398

#	Time	Username	Problem	Language	Result	Execution time	Memory
600398		xynex	Xylophone (JOI18_xylophone)	C++17	100 / 100	119 ms	448 KiB

xylophone

/**
  * Author: Tenjin
  * Created: 28.06.2022 14:48
  * Why am I so stupid? :c
  * Slishkom slab
**/

#include <bits/stdc++.h>
#include "xylophone.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 ll INF = 9e18;
const int M = 2e3 + 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*/


static const int N_MAX = 5000;

int ANS[N_MAX], X[N_MAX], Y[N_MAX];
void solve(int N) {
  for(int i = 1; i < N; ++i) {
    X[i] = query(i, i + 1);
    //write(X[i], ' ');
  }
  //print("");
  for(int i = 2; i < N; ++i) {
    Y[i - 1] = query(i - 1, i + 1);
    //write(Y[i - 1], ' ');
  }
  //print("");
  bool ok = 1;
  ANS[2] = X[1];
  for(int i = 2; i < N; ++i) {
    if(X[i - 1] + X[i] != Y[i - 1]) {
      ok ^= 1;
    }
    ANS[i + 1] = ANS[i] + X[i] * ((int)ok * 2 - 1);
  }
  int mx = 0, pos1 = 0, mn = 0, pos2 = 0;
  for(int i = 1; i <= N; ++i) {
    if(ANS[i] > mx) {
      mx = ANS[i];
      pos1 = i;
    }
    else if(ANS[i] < mn) {
      mn = ANS[i];
      pos2 = i;
    }
  }
  if(pos1 < pos2) {
    for(int i = 1; i <= N; ++i) {
      answer(i, mx - ANS[i] + 1);
    }
  }
  else {
    for(int i = 1; i <= N; ++i) {
      answer(i, ANS[i] - mn + 1);
    }
  }
}

Compilation message (stderr)

xylophone.cpp: In function 'void freop(std::string)':
xylophone.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);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
xylophone.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: 11 / 11
• Subtask 2: 36 / 36
• Subtask 3: 53 / 53