Submission #251362

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
251362	2020-07-21 02:40:57	shenxy	Password (RMI18_password)	C++14	100 / 100	255 ms	744 KiB

password

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#include <algorithm>
#include <string>
using namespace std;
int cnt[26];
int query(string str);
string dnc(int s, int e) {
  if (s == e) {
    string ans = "";
    for (int i = 0; i < cnt[s]; ++i) ans.push_back('a' + s);
    return ans;
  }
  string l = dnc(s, (s + e) / 2), r = dnc((s + e) / 2 + 1, e);
  int ptr = 0;
  for (char c: r) {
    string x = l;
    x.insert(ptr, 1, c);
    while (query(x) != x.length()) x = l, x.insert(++ptr, 1, c);
    l = x;
    ++ptr;
  }
  return l;
}
string guess(int N, int S) {
  for (int i = 0; i < S; ++i) {
    string Q = "";
    for (int j = 0; j < N; ++j) Q.push_back('a' + i);
    cnt[i] = query(Q);
  }
  return dnc(0, S - 1);
}
 
 
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Compilation message (stderr)

password.cpp: In function 'std::__cxx11::string dnc(int, int)':
password.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (query(x) != x.length()) x = l, x.insert(++ptr, 1, c);
          ~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 30 / 30
• Subtask 5: 20 / 20