Submission #986831

#	Time	Username	Problem	Language	Result	Execution time	Memory
986831		Tsagana	Combo (IOI18_combo)	C++14	10 / 100	27 ms	600 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>

#define all(x) x.begin(), x.end()
#define pq priority_queue
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define eb emplace_back
#define F first
#define S second

using namespace std;

char ch(char c) {
  if (c == 'A') return 'B';
  if (c == 'B') return 'X';
  if (c == 'X') return 'Y';
  if (c == 'Y') return 'A';
}
string guess_sequence(int N) {
  string p = "";
  string s = "";
  int leng = 0;
  int coin = 0;
  char c = 'A';
  char fc;

  while (leng < N) {
    p = s;
    for (int i = leng; i < N; i++) p += c;
    coin = press(p);
    if (!leng && coin) fc = c;
    if (coin > leng) for (; leng < coin; leng++) s += c;
    else c = ch(c); if (c == fc) c = ch(c);
  }
  return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:35:5: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   35 |     else c = ch(c); if (c == fc) c = ch(c);
      |     ^~~~
combo.cpp:35:21: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   35 |     else c = ch(c); if (c == fc) c = ch(c);
      |                     ^~
combo.cpp: In function 'char ch(char)':
combo.cpp:20:1: warning: control reaches end of non-void function [-Wreturn-type]
   20 | }
      | ^
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:35:21: warning: 'fc' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |     else c = ch(c); if (c == fc) c = ch(c);
      |                     ^~

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