Submission #481607

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Source Code Expand

#include <iostream>

using namespace std;

int main(void) {
  int n, k;
  cin >> n >> k;
  // 3回試行する
  // 1 ~ Nが等確率
  // ソート結果をx1, x2, x3とすると … x2 == Kとなる確率
  // パターンはn * n * n == n^3
  // (x1<=K) * 1 * (K<=x3)
  // K * 1 * (N-K)
//  long double result = ((long double)k / n) * ((long double)(n - k + 1) / n) * ((long double)1 / n) * 6;
//  long double result = (k * (n - k + 1) * 1 * 6) / (long double)(n * n * n);
//  long double result = ((long long)(k * 1000000) / n) * ((long long)((n - k + 1) * 1000000) / n) * ((long long)(1 * 1000000) / n) * 6 / (long double)1000000;
  long double result = (((long double)k / n) * 1000000) * (((long double)(n - k + 1) / n) * 1000000) * (((long double)1 / n) * 1000000) * (6 * 1000) / 1000000000000000000000;
  cout << result << endl;
  return 0;
}

Submission Info

Compile Error

./Main.cpp:17:152: warning: integer constant is too large for its type
   long double result = (((long double)k / n) * 1000000) * (((long double)(n - k + 1) / n) * 1000000) * (((long double)1 / n) * 1000000) * (6 * 1000) / 1000000000000000000000;
                                                                                                                                                        ^

Judge Result