Submission #199695

#	Time	Username	Problem	Language	Result	Execution time	Memory
199695		mohamedsobhi777	Password (RMI18_password)	C++17	Compilation error	0 ms	0 KiB

password

// Sample grader for contestants' use.
//
// Usage: place your input data in the file password.in in the format
//
// line 1: N S
// line 2: hidden_password
//
// Then compile this grader together with your implementation.
// Run the binary to see your guessing strategy at work!
// Set DEBUG to 1 to print all queries.
#include <bits/stdc++.h>
#include <iostream>
#include <sstream>
#include <string>
#include <stdlib.h>
#include <assert.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) { /* found a match */
      i++;
      j++;
    }
  }

  if (DEBUG) {
    cout << "Question #" << numQueries << " [" << q << "] answer " << j << endl;
  }
  return j;
}

string a[1000];

vector<int> acc(26 , 0);



string merg(string aa , string bb)
{
    int s1 = aa.size();
    int s2 = bb.size();
    string ret = aa;
    int j = s2-1;
    for(int i = s1;i>=0&&j>=0;i--)
    {
        string tmp ;
        bool ok = 1;
        while(ok && j>=0)
        {
            tmp = ret.substr(0 , i) + bb[j];
            tmp+=ret.substr( i , s1 - i );
            if(query(tmp)==tmp.size())
            {
                ret = tmp;
                s1++;
                j--;
            }else ok = 0;
        }


    }
    return ret ;
}

string build(int l, int r )
{

    if(l==r)
    {
        return string( acc[l] , char(l + 'a'));
    }
    else
    {
        int mid = (l + r) /2;
        string s1 = build(l , mid );
        string s2 = build(mid+1 , r);
        string ret = merg(s1 , s2);
        return ret;
    }
}



string guess(int n, int s)
{
    int sum = 0;
    for(int i = 'a';i<'a' + s -1 ;i++)
    {
        acc[i-'a'] = query(string(n , char(i)));
        sum+=acc[i-'a'];
    }
    acc[s - 1] =  n  - sum;
    return build(0 , s-1);
}

int main() {

  ifstream f("password.in");
  f >> 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::__cxx11::string merg(std::__cxx11::string, std::__cxx11::string)':
password.cpp:95:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(query(tmp)==tmp.size())
                ~~~~~~~~~~^~~~~~~~~~~~
/tmp/ccnvEb0y.o: In function `query(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
grader.cpp:(.text+0x0): multiple definition of `query(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/tmp/ccKDtHY4.o:password.cpp:(.text+0x200): first defined here
/tmp/ccnvEb0y.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccKDtHY4.o:password.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status