title: Number Days Tank Will Become Empty
signature: int numberDaysTankWillBecomeEmpty(int c, int l) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(int actual, int expected){
      return actual == expected;
  }
  
  string driver(int c, int l, int expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(c, l), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver(91, 29, 40); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver(99, 55, 64); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver(11, 56, 11); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver(23, 56, 23); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver(12, 97, 12); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver(1, 64, 1); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver(18, 5, 10); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver(14, 37, 14); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver(13, 55, 13); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver(36, 99, 36); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
source_py: def number_days_tank_will_become_empty(C, l):
      if (l >= C):
          return C
      eq_root = ((math.sqrt((1 + (8 * (C - l)))) - 1) / 2)
      return (math.ceil(eq_root) + l)
source_cpp: int number_days_tank_will_become_empty(int C, int l) {
    if ( l >= C ) return C;
    double eq_root = ( std :: sqrt ( 1 + 8 * ( C - l ) ) - 1 ) / 2;
    return std :: ceil ( eq_root ) + l;
  }