제출 #1051672

#제출 시각아이디문제언어결과실행 시간메모리
1051672otariusColors (BOI20_colors)C++17
100 / 100
2 ms700 KiB
#include <bits/stdc++.h> #include <bits/extc++.h> using namespace __gnu_pbds; using namespace std; // #pragma GCC optimize("Ofast") // #pragma GCC optimize ("unroll-loops") // #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #define ff first #define sc second #define pb push_back #define ll long long #define pll pair<ll, ll> #define pii pair<int, int> #define ull unsigned long long #define all(x) (x).begin(),(x).end() // #define int long long // #define int unsigned long long // #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update> // #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> void open_file(string filename) { freopen((filename + ".in").c_str(), "r", stdin); freopen((filename + ".out").c_str(), "w", stdout); } // const ll mod = 1e9 + 7; // const ll mod = 998244353; const ll inf = 1e9; const ll biginf = 1e18; const int maxN = 1e5 + 25; int ask(ll m) { cout << "? " << m << endl; int x; cin >> x; return x; } void solve() { ll n, x; cin >> n; vector<ll> v; ll l = 0, r = n, pos = 1; while (r - l > 1) { v.pb((l + r) / 2); l = (l + r) / 2; } for (int i = v.size() - 1; i >= 0; i--) { if (pos + v[i] <= n) pos += v[i]; else pos -= v[i]; } ask(pos); set<ll> used; used.insert(pos); l = 0; r = n; while (r - l > 1) { ll m = (l + r) / 2; if (pos + m <= n && used.find(pos + m) == used.end()) pos += m; else pos -= m; x = ask(pos); used.insert(pos); if (x) r = m; else l = m; } cout << "= " << r << endl; } int32_t main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); int t = 1; // cin >> t; while (t--) { solve(); cout << '\n'; } return 0; }

컴파일 시 표준 에러 (stderr) 메시지

Colors.cpp: In function 'void open_file(std::string)':
Colors.cpp:26:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Colors.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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