Submission #1051574

---

Source Code Expand

#include <algorithm>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <iomanip>
#include <iostream>
#include <limits>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <tuple>
#include <vector>

#define FOR(i,k,n) for (int (i)=(k); (i)<(n); ++(i))
#define rep(i,n) FOR(i,0,n)
#define pb push_back
#define all(v) begin(v), end(v)
#define debug(x) cerr<< #x <<": "<<x<<endl
#define debug2(x,y) cerr<< #x <<": "<< x <<", "<< #y <<": "<< y <<endl

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef vector<ll> vll;
typedef vector<vector<ll> > vvll;
template<class T> using vv=vector<vector< T > >;

ll lcm (ll x, ll y) {
  return x / __gcd(x, y) * y;
}

struct Ratio {
  ll num;
  ll den;
  Ratio() {}
  Ratio(ll n, ll d) {
    num = n;
    den = d;
    reduce();
  }
  void reduce() {
    ll g = __gcd(num, den);
    num /= g;
    den /= g;
  }
  Ratio operator - () const { return Ratio(-num, den); }
  Ratio &operator += (const Ratio &r){
    ll l = lcm(den, r.den);
    num *= (l / den);
    num += (l / r.den * r.num);
    den = l;
    reduce();
    return *this;
  }
  Ratio operator + (const Ratio &r) {
    return Ratio(*this) += r;
  }
  Ratio &operator -= (const Ratio &r){
    return *this += (-r);
  }
  Ratio operator - (const Ratio &r) {
    return Ratio(*this) -= r;
  }
};

int main() {
  ll x, y;
  scanf("%lld/%lld", &x, &y);
  ll g = __gcd(x, y);
  x /= g;
  y /= g;
  ll orig = (ll)floor((double)x * 2.0 / y);

  Ratio xy(x, y);
  vvll ans;
  rep (i, 2) {
    ll N = orig + i;
    if (N == 0) {
      continue;
    }
    Ratio mn = Ratio(1+N, 2) - xy;
    if (N % mn.den != 0) {
      continue;
    }
    ans.push_back({N, N / mn.den * mn.num});
  }

  if (ans.empty()) {
    printf("Impossible\n");
    return 0;
  }

  for (auto elm : ans) {
    printf("%lld %lld\n", elm[0], elm[1]);
  }

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:78:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld/%lld", &x, &y);
                             ^

Judge Result