Submission #331744

#	Time	Username	Problem	Language	Result	Execution time	Memory
331744		dolphingarlic	Password (RMI18_password)	C++14	0 / 100	20 ms	364 KiB

password

#include <string>
using namespace std;

extern int query(string str);

string solve(int l, int r, int n) {
    if (l == r) {
        string to_guess = "";
        for (int i = 0; i < n; i++) to_guess += 'a' + l;
        int len = query(to_guess);
        string ret = "";
        for (int i = 0; i < len; i++) ret += 'a' + l;
        return ret;
    } else {
        int mid = (l + r) / 2;
        string a = solve(l, mid, n), b = solve(mid + 1, r, n);
        int a_ptr = 0, b_ptr = 0;
        string known = "";
        while (a_ptr < a.size() && b_ptr < b.size()) {
            string to_guess = known + a[a_ptr];
            if (query(to_guess) > known.size()) known += a[a_ptr++];
            else known += b[b_ptr++];
        }
        while (a_ptr < a.size()) known += a[a_ptr++];
        while (b_ptr < b.size()) known += b[b_ptr++];
        return known;
    }
}

string guess(int n, int s) { return solve(0, s - 1, n); }

Compilation message (stderr)

password.cpp: In function 'std::string solve(int, int, int)':
password.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |         while (a_ptr < a.size() && b_ptr < b.size()) {
      |                ~~~~~~^~~~~~~~~~
password.cpp:19:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |         while (a_ptr < a.size() && b_ptr < b.size()) {
      |                                    ~~~~~~^~~~~~~~~~
password.cpp:21:33: 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 (query(to_guess) > known.size()) known += a[a_ptr++];
      |                 ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
password.cpp:24:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         while (a_ptr < a.size()) known += a[a_ptr++];
      |                ~~~~~~^~~~~~~~~~
password.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         while (b_ptr < b.size()) known += b[b_ptr++];
      |                ~~~~~~^~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20