Problem p02399 (C++) — buggy submission, verdict: Runtime Error

#include <algorithm>
#include <array>
#include <bitset>
#include <chrono>
#include <cmath>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <vector>
using namespace std;
typedef unsigned long long int ulint;
typedef long long int llint;
typedef long double lldo;
#define mp make_pair
#define mt make_tuple
#define pub push_back
#define puf push_front
#define pob pop_back
#define pof pop_front
#define fir first
#define sec second
#define res resize
#define ins insert
#define era erase
#define RE return 0
// ios::sync_with_stdio(false);
// std::cin.tie(0);
//<< setprecision(20)
const int mod = (int)1e9 + 7;
const llint big = (llint)(2.19e12 + 1);
const long double pai = 3.141592653589793238462643383279502884197;
const long double ena = 2.71828182845904523536;
const long double eps = 1e-7;
template <class T, class U> bool mineq(T &a, U b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T, class U> bool maxeq(T &a, U b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> void soun(T &ar) {
  sort(ar.begin(), ar.end());
  ar.erase(unique(ar.begin(), ar.end()), ar.end());
}
llint gcd(llint a, llint b) {
  if (a % b == 0) {
    return b;
  } else {
    return gcd(b, a % b);
  }
}
llint lcm(llint a, llint b) { return a / gcd(a, b) * b; }
template <class T, class U> auto LB(T &ve, U in) {
  return lower_bound(ve.begin(), ve.end(), in);
}
template <class T, class U> auto UB(T &ve, U in) {
  return upper_bound(ve.begin(), ve.end(), in);
}
template <class T, class U> auto LBI(T &ve, U in) {
  return LB(ve, in) - ve.begin();
}
template <class T, class U> auto UBI(T &ve, U in) {
  return UB(ve, in) - ve.begin();
}
template <class T> void SO(T &ve) { sort(ve.begin(), ve.end()); }
template <class T> void REV(T &ve) { reverse(ve.begin(), ve.end()); }
int main(void) {
  llint a, b;
  cin >> a >> b;
  cout << fixed << setprecision(20);
  cout << a / b << " " << a % b << " " << ((double)a) / b << endl;
  RE;
}


Error: WA

Fixed submission:

#include <algorithm>
#include <array>
#include <bitset>
#include <chrono>
#include <cmath>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <vector>
using namespace std;
typedef unsigned long long int ulint;
typedef long long int llint;
typedef long double lldo;
#define mp make_pair
#define mt make_tuple
#define pub push_back
#define puf push_front
#define pob pop_back
#define pof pop_front
#define fir first
#define sec second
#define res resize
#define ins insert
#define era erase
#define RE return 0
// ios::sync_with_stdio(false);
// std::cin.tie(0);
//<< setprecision(20)
const int mod = (int)1e9 + 7;
const llint big = (llint)(2.19e12 + 1);
const long double pai = 3.141592653589793238462643383279502884197;
const long double ena = 2.71828182845904523536;
const long double eps = 1e-7;
template <class T, class U> bool mineq(T &a, U b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T, class U> bool maxeq(T &a, U b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> void soun(T &ar) {
  sort(ar.begin(), ar.end());
  ar.erase(unique(ar.begin(), ar.end()), ar.end());
}
llint gcd(llint a, llint b) {
  if (a % b == 0) {
    return b;
  } else {
    return gcd(b, a % b);
  }
}
llint lcm(llint a, llint b) { return a / gcd(a, b) * b; }
template <class T, class U> auto LB(T &ve, U in) {
  return lower_bound(ve.begin(), ve.end(), in);
}
template <class T, class U> auto UB(T &ve, U in) {
  return upper_bound(ve.begin(), ve.end(), in);
}
template <class T, class U> auto LBI(T &ve, U in) {
  return LB(ve, in) - ve.begin();
}
template <class T, class U> auto UBI(T &ve, U in) {
  return UB(ve, in) - ve.begin();
}
template <class T> void SO(T &ve) { sort(ve.begin(), ve.end()); }
template <class T> void REV(T &ve) { reverse(ve.begin(), ve.end()); }
int main(void) {
  int a, b;
  cin >> a;
  cout << setprecision(20);
  cout << a / b << " " << a % b << " " << ((double)a) / b << endl;
  RE;
}