Submission #380826

#	Time	Username	Problem	Language	Result	Execution time	Memory
380826		knightron0	Combo (IOI18_combo)	C++14	100 / 100	47 ms	568 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;

// string S;
// int press(string p) {
//   int coins = 0;
//   for (int i = 0, j = 0; i < p.size(); ++i) {
//     if (j < S.size() && S[j] == p[i]) {
//       ++j;
//     } else if (S[0] == p[i]) {
//       j = 1;
//     } else {
//       j = 0;
//     }
//     coins = max(coins, j);
//   }
//   cout<<p.size()<<' '<<S.size()*4<<' '<<coins<<endl;
//   return coins;
// }

string guess_sequence(int N){
	string tmp = "ABXY";
	string done = "";
	// first letter
	if(press("AB") >= 1){
		if(press("A") >= 1){
			done += "A";
			tmp = "BXY";
		} else {
			done += "B";
			tmp = "AXY";
		}
	} else {
		if(press("X") >= 1){
			done += "X";
			tmp = "ABY";
		} else {
			done += "Y";
			tmp = "ABX";
		}
	}
	while(done.size() < N-1){
		int exp = done.size()+1;
		string query = done + tmp[0] + done + tmp[1] + tmp[0] + done + tmp[1] + tmp[1] + done + tmp[1] + tmp[2];
		int q = press(query);
		if(q == exp){
			done += tmp[0];
		} else if(q == exp+1){
			done += tmp[1];
		} else {
			done += tmp[2];
		}
	}
	if(done.size() == N){
		return done;
	}
	string query = done + tmp[0];
	if(press(query) == N){
		done += tmp[0];
		return done;
	}
	query = done + tmp[1];
	if(press(query) == N){
		done += tmp[1];
		return done;
	}
	done += tmp[2];
	return done;
}
// signed main() {
//     ios_base::sync_with_stdio(false);
//     cin.tie(NULL);
//     // #ifdef LOCAL
//     // freopen("input.txt", "r", stdin);
//     // #endif
//     cin>>S;
//     cout<<guess_sequence(S.size())<<endl;
//     return 0;
// }

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:43:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |  while(done.size() < N-1){
      |        ~~~~~~~~~~~~^~~~~
combo.cpp:55:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   55 |  if(done.size() == N){
      |     ~~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95