Submission #464088

#	Time	Username	Problem	Language	Result	Execution time	Memory
464088		Mamedov	Password (RMI18_password)	C++17	30 / 100	519 ms	540 KiB

password

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#define ll long long
#define ui unsigned int
#define pii pair<int, int>
#define piii pair<int, pii>
#define pb push_back
#define f first
#define s second
#define oo (1ll << 60)

using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());


int query(string str);


string guess(int n, int s) {
    string str;
    vector<int>countLetter(s);
    int maxLetter = 0;
    for(int i = 0; i < s; ++i) {
        str = "";
        for(int j = 0; j < n; ++j) {
            str += ('a' + i);
        }
        countLetter[i] = query(str);
        if(countLetter[i] > countLetter[maxLetter]) {
            maxLetter = i;
        }
    }

    vector<int>pos;
    str = "";
    for(int i = 0; i < countLetter[maxLetter]; ++i) {
        str += ('a' + maxLetter);
        pos.pb(i);
    }
    pos.pb(str.length());

    for(int i = 0; i < s; ++i) {
        if(i == maxLetter) continue;
        for(int j = 0; j < countLetter[i]; ++j) {
            shuffle(pos.begin(), pos.end(), rng);
            for(int k = 0; k <= str.length(); ++k) {
                str.insert(str.begin() + pos[k], 'a' + i);
                if(query(str) == str.length()) {
                    pos.pb(str.length());
                    break;
                }
                str.erase(str.begin() + pos[k]);
            }
        }
    }
    return str;
}

Compilation message (stderr)

password.cpp: In function 'std::string guess(int, int)':
password.cpp:46:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |             for(int k = 0; k <= str.length(); ++k) {
      |                            ~~^~~~~~~~~~~~~~~
password.cpp:48:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |                 if(query(str) == str.length()) {
      |                    ~~~~~~~~~~~^~~~~~~~~~~~~~~

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