Submission #755968

#	Time	Username	Problem	Language	Result	Execution time	Memory
755968		vjudge1	Password (RMI18_password)	C++17	50 / 100	821 ms	428 KiB

password

#include <bits/stdc++.h>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <stdlib.h>
#include <assert.h>
#include <bits/stdc++.h>
using namespace std;

#define DEBUG 0
#define MAX_QUERIES 50000
#define MAX_N 5000
#define MAX_SIGMA 26

static string password;
static int n, s, numQueries;
static stringstream msg;

static void end(int success) {
  cout << (success ? "SUCCESS! " : "ERROR: ") << msg.str() << endl;
  exit(0);
}

/*int query(string q) {
  if (++numQueries > MAX_QUERIES) {
    msg << "Could not guess the password with " << MAX_QUERIES << " questions.";
    end(0);
  }

  int len = q.size();

  // validation
  if (len < 1 || len > n) {
    msg << "Query '" << q << "' should have length between 1 and "
        << n << " characters.";
    end(0);
  }

  for (int i = 0; i < len; i++) {
    if (q[i] < 'a' || q[i] >= 'a' + s) {
      msg << "Illegal character '" << q[i] << "' found.";
      end(0);
    }
  }

  // while possible, advance one character in q and find its next
  // occurrence in password
  int i = 0, j = 0, plen = password.size();
  while (i < plen && j < len) {
    while ((i < plen) && (password[i] != q[j])) {
      i++;
    }
    if (i < plen) {  
      i++;
      j++;
    }
  }

  if (DEBUG) {
    cout << "Question #" << numQueries << " [" << q << "] answer " << j << endl;
  }
  return j;
}*/
int query(string q);
string guess(int n, int s){
    string res="";
    int sum=0;
    int cur=0;
    int tab[s];
    for (int i = 0; i < s; ++i)
    {
        string t="";
        for (int j = 0; j < n; ++j)
        {
            char x=char(i+'a');
            t.push_back(x);
        }
        tab[i]=query(t);
    }
    int check[s];
    memset(check,0,sizeof check);
    int lst=-1;
    while(cur<n)
    {
        bool test=false;
        for (int i = 0; i < s; ++i)
        {
            if (check[i]==tab[i]) continue;
            if (lst!=-1&&i<lst) continue;
            string t="";
            char x=char(i+'a');
            for (int i = 0; i < cur; ++i)
            {
                t.push_back(res[i]);
            }t.push_back(x);
            for (int i = cur; i < res.size(); ++i)
            {
                t.push_back(res[i]);
            }
            if (t.size()>n) break;
            if (query(t)>sum){
                sum++;
                check[i]++;
                test=true;
                res="";
                lst=i;
                for (int i = 0; i < t.size(); ++i)
                {
                    res.push_back(t[i]);
                }
                break;
            }
        }
        if(!test||lst==s-1){
            cur++;
            lst=-1;
        }
    }
    //cout<< sum<<endl;
    return res;
}

/*int main() {
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
  //ifstream f("password.in");
  cin >> n >> s >> password;
    //f.close();
  assert(n && s && !password.empty());

  string answer = guess(n, s);
  if (DEBUG) {
    cout << "Your answer: [" << answer << "]\n";
  }

  if (answer.compare(password)) {
    msg << "Your answer was [" << answer
        << "] which does not match the password [" << password << "].";
    end(0);
  } else {
    msg << "You guessed the password with " << numQueries << " queries.";
    end(1);
  }

    return 0;
}*/

Compilation message (stderr)

password.cpp: In function 'std::string guess(int, int)':
password.cpp:97:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |             for (int i = cur; i < res.size(); ++i)
      |                               ~~^~~~~~~~~~~~
password.cpp:101:25: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  101 |             if (t.size()>n) break;
      |                 ~~~~~~~~^~
password.cpp:108:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  108 |                 for (int i = 0; i < t.size(); ++i)
      |                                 ~~^~~~~~~~~~
password.cpp: At global scope:
password.cpp:20:13: warning: 'void end(int)' defined but not used [-Wunused-function]
   20 | static void end(int success) {
      |             ^~~
password.cpp:17:18: warning: 'numQueries' defined but not used [-Wunused-variable]
   17 | static int n, s, numQueries;
      |                  ^~~~~~~~~~
password.cpp:17:15: warning: 's' defined but not used [-Wunused-variable]
   17 | static int n, s, numQueries;
      |               ^
password.cpp:17:12: warning: 'n' defined but not used [-Wunused-variable]
   17 | static int n, s, numQueries;
      |            ^

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