Submission #827695

#TimeUsernameProblemLanguageResultExecution timeMemory
827695QwertyPiColors (BOI20_colors)C++14
0 / 100
0 ms208 KiB
#include <bits/stdc++.h> using namespace std; #ifndef LOCAL bool qry(int x){ cout << "? " << x << endl; bool r; cin >> r; return r; } void answer(int x){ cout << "= " << x << endl; exit(0); } #else int prv = -1, N, C; bool qry(int x){ assert(1 <= x && x <= N); if(prv == -1) { prv = x; return 0; } bool res = abs(x - prv) >= C; prv = x; return res; } void answer(int x){ assert(x == C); } #endif void solve(int N){ int lo = 1, hi = N; while(lo != hi){ int mid = (lo + hi) / 2; qry(1); if(qry(mid + 1)){ hi = mid; }else{ lo = mid + 1; } } cout << lo << endl; answer(lo); } int32_t main(){ #ifdef LOCAL random_device rd; mt19937 rng(rd()); const int MX = 10; for(int t = 0; t < 1000; t++){ N = rng() % MX + 1; C = rng() % N + 1; solve(N); } #else int N; cin >> N; solve(N); #endif }
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