Submission #1113563

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113563		Zflop	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
using namespace std;
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
 
#include "combo.h"
string letter = "ABXY";
std::string guess_sequence(int N) {
  string ans;
  vector<char>actual;
  for (int i = 0; i < 4;++i)
	if (press(letter[i])) {
		ans += letter[i];
		}
	else 
		actual.push_back(letter[i]);
	while(ans.size() < N - 1) {
		string g = ans + actual[0] + actual[0] + ans + actual[0] + actual[1] + ans + actual[0] + actual[2] + ans + actual[1];
		int ret = press(g);
		if (ret == ans.size())
			ans += actual[2];
		else if (ret == ans.size() + 1)
			ans += actual[1];
		else 
			ans += actual[0];
		}
	string g = ans + actual[0];
	if (press(g) == N) return g;
	g = ans + actual[1];
	if (press(g) == N) return g;
  return ans + actual[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:13:21: error: could not convert 'letter.std::__cxx11::basic_string<char>::operator[](((std::__cxx11::basic_string<char>::size_type)i))' from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   13 |  if (press(letter[i])) {
      |                     ^
      |                     |
      |                     __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}
combo.cpp:12:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   12 |   for (int i = 0; i < 4;++i)
      |   ^~~
combo.cpp:18:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   18 |  while(ans.size() < N - 1) {
      |  ^~~~~
combo.cpp:18:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   18 |  while(ans.size() < N - 1) {
      |        ~~~~~~~~~~~^~~~~~~
combo.cpp:21:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |   if (ret == ans.size())
      |       ~~~~^~~~~~~~~~~~~
combo.cpp:23:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |   else if (ret == ans.size() + 1)
      |            ~~~~^~~~~~~~~~~~~~~~~