ConcatenateNumber.cpp

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#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
using namespace std;
class ConcatenateNumber {
public:
  int getSmallest(int number, int k) {
    int ret = 1;
    long long mod = 0;
    set <long long> s;
    long long p = 1;

    if (number % k == 0)
      return 1;

    while (p <= number)
      p *= 10;

    mod = number % k;

    while (mod != 0) {
      s.insert(mod);
      mod = (mod * p  + number) % k;
      ret++;
      if (s.find(mod) != s.end())
        return -1;
    }

    return ret;
  }
   
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public:
	void run_test(int Case) { if ((Case == -1) || (Case == 0)) test_case_0(); if ((Case == -1) || (Case == 1)) test_case_1(); if ((Case == -1) || (Case == 2)) test_case_2(); if ((Case == -1) || (Case == 3)) test_case_3(); if ((Case == -1) || (Case == 4)) test_case_4(); }
private:
	template <typename T> string print_array(const vector<T> &V) { ostringstream os; os << "{ "; for (typename vector<T>::const_iterator iter = V.begin(); iter != V.end(); ++iter) os << '\"' << *iter << "\","; os << " }"; return os.str(); }
	void verify_case(int Case, const int &Expected, const int &Received) { cerr << "Test Case #" << Case << "..."; if (Expected == Received) cerr << "PASSED" << endl; else { cerr << "FAILED" << endl; cerr << "\tExpected: \"" << Expected << '\"' << endl; cerr << "\tReceived: \"" << Received << '\"' << endl; } }
	void test_case_0() { int Arg0 = 2; int Arg1 = 9; int Arg2 = 9; verify_case(0, Arg2, getSmallest(Arg0, Arg1)); }
	void test_case_1() { int Arg0 = 121; int Arg1 = 11; int Arg2 = 1; verify_case(1, Arg2, getSmallest(Arg0, Arg1)); }
	void test_case_2() { int Arg0 = 1; int Arg1 = 2; int Arg2 = -1; verify_case(2, Arg2, getSmallest(Arg0, Arg1)); }
	void test_case_3() { int Arg0 = 35; int Arg1 = 98765; int Arg2 = 9876; verify_case(3, Arg2, getSmallest(Arg0, Arg1)); }
	void test_case_4() { int Arg0 = 1000000000; int Arg1 = 7; int Arg2 = 3; verify_case(4, Arg2, getSmallest(Arg0, Arg1)); }

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};
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int main() {
ConcatenateNumber ___test;
___test.run_test(-1);
}
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