Submission #1117171

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117171		allin27x	Password (RMI18_password)	C++17	50 / 100	1026 ms	1480 KiB

password

#include <bits/stdc++.h>
using namespace std;
 
int query(string str);
 
string guess(int n, int s){
    mt19937 rng(time(nullptr));
    string res;
    vector<int> nc(s, 0);
    vector<int> to(s, -1);
    for (int i=0; i<s; i++) nc[i] = query(string(n,'a'+i));
    int last = -1;
    while (res.size()<n){
        string rev = res; reverse(rev.begin(), rev.end());
        vector<int> rel;
        for (int i=0; i<s; i++) 
            if (nc[i] && (i==last || to[i] == last)) rel.push_back(i);
        int mx = rel[0];
        for (int i: rel){
            if (i== rel[0]) continue;
            if (!nc[i] || (i!=last && to[i]!=last)) continue;
            if (query(string(nc[i], 'a'+i) + string(1,'a'+mx) + rev) != nc[i] + 1 + res.size()) {
                to[mx] = i;
                mx = i;
            } else {
                to[i] = mx;
            }
        }
        nc[mx] --; res += 'a' + mx;
        last = mx;
    }
    reverse(res.begin(), res.end());
    return res;
}

Compilation message (stderr)

password.cpp: In function 'std::string guess(int, int)':
password.cpp:13:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   13 |     while (res.size()<n){
      |            ~~~~~~~~~~^~
password.cpp:22:70: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |             if (query(string(nc[i], 'a'+i) + string(1,'a'+mx) + rev) != nc[i] + 1 + res.size()) {
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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