Submission #654927

#	Time	Username	Problem	Language	Result	Execution time	Memory
654927		xynex	Aliens (IOI07_aliens)	C++17	50 / 100	3 ms	296 KiB

aliens

/**
  * Author: Tenjin
  * Created: 02.11.2022 11:05
  * 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 mxN = 3e6 + 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*/

int N;
bool bounds(int x, int y) {
  return (x >= 1 && x <= N && y >= 1 && y <= N);
}
bool ask(int x, int y) {
  if(!bounds(x, y)) return 0;
  print("examine", x, y);
  string s; read(s);
  fflush(stdout);
  if(s == "true") return 1;
  else return 0;
}
int left(int x, int y) {
  int pw = 1;
  while(1) {
    if(!bounds(x, y - pw)) {
      pw = y - 1;
      break;
    }
    if(!ask(x, y - pw)) break;
    pw *= 2;
  }
  int l = y - pw, r = y;
  while((r - l) >= 0) {
    int mid = (r + l) >> 1;
    if(ask(x, mid)) r = mid - 1;
    else l = mid + 1;
  }
  return r + 1;
}

int right(int x, int y) {
  int pw = 1;
  while(1) {
    if(!bounds(x, y + pw)) {
      pw = N - y;
      break;
    }
    if(!ask(x, y - pw)) break;
    pw *= 2;
  }
  int l = y, r = y + pw;
  while((r - l) >= 0) {
    int mid = (r + l) >> 1;
    if(ask(x, mid)) l = mid + 1;
    else r = mid - 1;
  }
  return l - 1;
}

int left1(int x, int y) {
  int pw = 1;
  while(1) {
    if(!bounds(x - pw, y)) {
      pw = x - 1;
      break;
    }
    if(!ask(x - pw, y)) break;
    pw *= 2;
  }
  int l = x - pw, r = x;
  while((r - l) >= 0) {
    int mid = (r + l) >> 1;
    if(ask(mid, y)) r = mid - 1;
    else l = mid + 1;
  }
  return r + 1;
}

int right1(int x, int y) {
  int pw = 1;
  while(1) {
    if(!bounds(x + pw, y)) {
      pw = N - x;
      break;
    }
    if(!ask(x + pw, y)) break;
    pw *= 2;
  }
  int l = y, r = x + pw;
  while((r - l) >= 0) {
    int mid = (r + l) >> 1;
    if(ask(mid, y)) l = mid + 1;
    else r = mid - 1;
  }
  return l - 1;
}

void solve() {
  int X, Y; read(N, X, Y);
  int leftY = left(X, Y), rightY = right(X, Y);
  int leftX = left1(X, Y), rightX = right(X, Y);
  int M = rightY - leftY + 1;
  X = leftX + M / 2;
  Y = leftY + M / 2;
  bool duet = ask(X - M, Y + M) & ask(X - M, Y - M) & ask(X + M, Y - M) & ask(X + M, Y + M);
  if(duet) {
    int ansX = 0, ansY = 0;
    if(ask(X, Y + M * 2)) ansY = Y + M;
    else ansY = Y - M;
    if(ask(X + M * 2, Y)) ansX = X + M;
    else ansX = X - M;
    print("solution", ansX, ansY);
    return;
  }
  if(!ask(X - M * 2, Y)) X += M * 2;
  else if(!ask(X + M * 2, Y)) X -= M * 2;
  if(!ask(X, Y - M * 2)) Y += M * 2;
  else if(!ask(X, Y + M * 2)) Y -= M * 2;
  print("solution", X, Y);
}

int main() {
  //freop("");
  int t = 1;
  //read(t);
  for (int i = 1; i <= t; ++i) {
    //write("Case #" + to_string(i) + ": ");
    solve();
  }
  return 0;
}

Compilation message (stderr)

aliens.cpp: In function 'void solve()':
aliens.cpp:179:28: warning: unused variable 'rightX' [-Wunused-variable]
  179 |   int leftX = left1(X, Y), rightX = right(X, Y);
      |                            ^~~~~~
aliens.cpp: In function 'void freop(std::string)':
aliens.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);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
aliens.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: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10