Submission #918145

#	Time	Username	Problem	Language	Result	Execution time	Memory
918145		vjudge1	Password (RMI18_password)	C++17	100 / 100	138 ms	1604 KiB

password

#include <bits/stdc++.h>
 
// author: aykhn
 
using namespace std;
 
typedef long long ll;
#define pb push_back
#define ins insert
#define mpr make_pair
 
int cnt[30];
priority_queue<pair<int, string>, vector<pair<int, string>>, greater<pair<int, string>>> pq;
 
int query(string str);
 
void MERGE(string &a, string &b)
{
    int prev = query(b);
 
    int i = 0;
 
    for (int j = 0; j <= b.length() && i < a.length(); j++)
    {
        string tmp = b;
        b.ins(b.begin() + j, a[i]);
        int x = query(b);
        if (x <= prev) b = tmp;
        else prev = x, i++;
    }
}
 
string guess(int n, int s)
{
    string tmp = "";
    for (int i = 0; i < n; i++)
    {
        tmp.pb('a');
    }
    int prev = 0;
 
    for (int i = 0; i < s; i++)
    {
        cnt[i] = query(tmp);
        pq.push(mpr(cnt[i], tmp.substr(0, cnt[i])));
 
        for (int j = 0; j < n; j++) tmp[j]++;
    }
 
    while (pq.size() > 1)
    {
        string A = pq.top().second;
        pq.pop();
        string B = pq.top().second;
        pq.pop();
 
        MERGE(A, B);
 
        pq.push(mpr(B.length(), B));
    }
 
    return pq.top().second;
}
 

Compilation message (stderr)

password.cpp: In function 'void MERGE(std::string&, std::string&)':
password.cpp:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for (int j = 0; j <= b.length() && i < a.length(); j++)
      |                     ~~^~~~~~~~~~~~~
password.cpp:23:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for (int j = 0; j <= b.length() && i < a.length(); j++)
      |                                        ~~^~~~~~~~~~~~
password.cpp: In function 'std::string guess(int, int)':
password.cpp:40:9: warning: unused variable 'prev' [-Wunused-variable]
   40 |     int prev = 0;
      |         ^~~~

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