Submission #503463

#	Time	Username	Problem	Language	Result	Execution time	Memory
503463		devomega07	Colors (BOI20_colors)	C++14	0 / 100	1 ms	200 KiB

Colors

#include "bits/stdc++.h"
#define all(x) x.begin(),x.end()
#define int long long
//#define OSET
using namespace std;

#ifdef OSET
#include "C:\MinGW\lib\gcc\mingw32\6.3.0\include\c++\ext\pb_ds\assoc_container.hpp"
#include "C:\MinGW\lib\gcc\mingw32\6.3.0\include\c++\ext\pb_ds\tree_policy.hpp"
using namespace __gnu_pbds;
template<typename T>
using oset = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
int n;
inline void IO(int num, bool &verd){
	cout << "? " << num << endl;
	int numbb;
	cin >> numbb;
	verd = numbb;
	return;
}

inline int get(int prev, int diff, bool verdict){
	return (prev+diff)%(n+1);
}
//#define debug
signed main(){
	ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
	cin >> n;
	bool temp;
	IO(1,temp);
	int numb = 63;
	int prev = 1, low = 1, high = n, mid = (high+low)>>1;
	bool verdict=0;
	int best=-1;
	while(numb--){
		mid=(high+low+1)>>1;
#ifdef debug
		cout << "Searching if he will notice " << mid << '\n';
#endif	
		int col = get(prev,mid,verdict);
		if(mid==best){
			cout << "= " << mid << endl;
			return 0;
		}
		IO(col,verdict);
#ifdef debug
		cout << boolalpha << verdict << '\n';
#endif
		if(verdict)	high = mid-1, best=mid;
		else low = mid+1;
		prev = col;	
	}
	return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33