Submission #995553

#	Time	Username	Problem	Language	Result	Execution time	Memory
995553		amine_aroua	Password (RMI18_password)	C++17	Compilation error	0 ms	0 KiB

password

#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
using namespace std;
#define int long long
#define pb push_back
#define nl '\n'
#define fore(i, y) for(int i = 0; i < y; i++)
#define forr(i, x, y) for(int i = x;i<=y;i++)
#define forn(i, y, x) for(int i = y; i >= x; i--)


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 comb(string a , string b)
{
    if(b.empty())
        return a;
    if(a.empty())
        return b;
    string cur = "";
    vector<string> suf;
    forn(i , (int)b.size() - 1 , 0)
    {
        cur+=b[i];
        string rcur = cur;
        reverse(rcur.begin() , rcur.end());
        suf.pb(rcur);
    }
    reverse(suf.begin() , suf.end());
    suf.pb("");
    string res = "";
    int ptr = 0;
    forr(i , 0 , (int)b.size())
    {
        if(ptr == (int)a.size())
        {
            if(i < (int)b.size())
                res+=b[i];
            continue;
        }
        string beg = "";
        beg+=a[ptr];
        string new_res = res + beg + suf[i];
        while(query(new_res) == (int)new_res.size())
        {
            res = res + beg;
            ptr++;
            if(ptr == (int)a.size())
                break;
            beg = "";
            beg+=a[ptr];
            new_res = res + beg + suf[i];
        }
        if(i < (int)b.size())
            res+=b[i];
    }
    return res;
}
string get(int l , int r , int &N)
{
    if(l == r)
    {
        string str = string(N , (char)('a' + l));
        int L = query(str);
        return string(L , (char)('a' + l));
    }
    int mid = (l + r)/2;
    string a = get(l , mid , N) , b = get(mid + 1 , r , N);
    return comb(a , b);
}
string guess(int N, int S)
{
    return get(0 , S - 1 , N);
}

signed 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)

/usr/bin/ld: /tmp/ccguCxAI.o: in function `query(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
grader.cpp:(.text+0x80): multiple definition of `query(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'; /tmp/ccJBYOJF.o:password.cpp:(.text+0x1b0): first defined here
/usr/bin/ld: /tmp/ccguCxAI.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccJBYOJF.o:password.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccguCxAI.o: in function `main':
grader.cpp:(.text.startup+0x66): undefined reference to `guess[abi:cxx11](int, int)'
collect2: error: ld returned 1 exit status