Submission #1038297

#TimeUsernameProblemLanguageResultExecution timeMemory
1038297SN0WM4NColors (BOI20_colors)C++14
0 / 100
0 ms344 KiB
#include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> #define sort undefined_function // To use stable_sort instead sort #define bpc __builtin_popcount #define ull unsigned long long #define ld double #define ll long long #define mp make_pair #define F first #define S second #pragma GCC optimize("O3") #ifdef LOCAL #include "debug.h" #else #define dbg(...) 0 #endif using namespace __gnu_pbds; using namespace std; typedef tree<long long, null_type, less_equal<long long>, rb_tree_tag, tree_order_statistics_node_update> Tree; mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); const ll INF = 9223372036854775807LL; const ll inf = 2147483647; const ll MOD = 998244353; //[998244353, 1e9 + 7, 1e9 + 13] const ld PI = acos(-1); const ll NROOT = 800; ll binpow(ll a, ll b, ll _MOD = -1) { if (_MOD == -1) _MOD = MOD; ll res = 1; for (; b; b /= 2, a *= a, a %= _MOD) if (b & 1) res *= a, res %= _MOD; return res; } void set_IO(string s) { #ifndef LOCAL string in = s + ".in"; string out = s + ".out"; freopen(in.c_str(), "r", stdin); freopen(out.c_str(), "w", stdout); #endif } bool dataOverflow(ll a, ll b) {return (log10(a) + log10(b) >= 18);} ll gcd(ll a, ll b) {return b ? gcd(b, a % b) : a;} ll lcm(ll a, ll b) {return a * b / gcd(a, b);} ll ceil(ll a, ll b) {return (a + b - 1) / b;} ll invmod(ll a) {return binpow(a, MOD - 2);} bool query(int x) { cout << "? " << x << "\n" << flush; int y; cin >> y; return (y == 1); } int32_t main() { // ios_base::sync_with_stdio(0); // cin.tie(0); int n; cin >> n; int l = 1, r = n, ans = -1; while (l <= r) { int mid = (l + r) / 2; query(1); bool aux = query(mid); if (aux) { ans = mid; l = mid + 1; } else { r = mid - 1; } } cout << "= " << ans << '\n'; return 0; }

Compilation message (stderr)

Colors.cpp: In function 'void set_IO(std::string)':
Colors.cpp:47:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         freopen(in.c_str(),  "r",  stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Colors.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen(out.c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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