oj.uz

답안 #15190

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
15190 2015-07-12T03:34:33 Z xhae 맛있는 과자 (kriii3_A) C++14
33 / 33
 0 ms 1220 KB 
#include <cstdio>
#include <algorithm>
#include <cmath>

using namespace std;

long long ptri[60][60];

int main()
{
  int a,b;
  long long N, K;
  scanf("%d%d%lld%lld",&a,&b,&N,&K);
  for (int i = 0; i <= 50; i++) {
    ptri[i][0] = ptri[i][i] = 1;
    for (int j = 1; j < i; j++) {
      ptri[i][j] = ptri[i-1][j] + ptri[i-1][j-1];
    }
  }
  if (a < b) swap(a,b);
  // now a > b
  double A = log((double)(a*a)/(a*a+b*b));
  double B = log((double)(b*b)/(a*a+b*b));
  // A > B
  for (int acnt = 0; acnt <= N; acnt++) {
    K -= ptri[N][acnt];
    if (K <= 0) {
      printf("%.15f\n", log(a*b/2.0) + A * (N-acnt) + B*acnt);
      return 0;
    }
  }
  return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 1220 KB Output is correct
2 Correct 0 ms 1220 KB Output is correct
3 Correct 0 ms 1220 KB Output is correct
4 Correct 0 ms 1220 KB Output is correct
5 Correct 0 ms 1220 KB Output is correct
6 Correct 0 ms 1220 KB Output is correct
7 Correct 0 ms 1220 KB Output is correct
8 Correct 0 ms 1220 KB Output is correct
9 Correct 0 ms 1220 KB Output is correct
10 Correct 0 ms 1220 KB Output is correct
11 Correct 0 ms 1220 KB Output is correct
12 Correct 0 ms 1220 KB Output is correct
13 Correct 0 ms 1220 KB Output is correct
14 Correct 0 ms 1220 KB Output is correct
15 Correct 0 ms 1220 KB Output is correct
16 Correct 0 ms 1220 KB Output is correct
17 Correct 0 ms 1220 KB Output is correct
18 Correct 0 ms 1220 KB Output is correct
19 Correct 0 ms 1220 KB Output is correct
20 Correct 0 ms 1220 KB Output is correct
21 Correct 0 ms 1220 KB Output is correct
22 Correct 0 ms 1220 KB Output is correct
23 Correct 0 ms 1220 KB Output is correct
24 Correct 0 ms 1220 KB Output is correct
25 Correct 0 ms 1220 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 1220 KB Output is correct
2 Correct 0 ms 1220 KB Output is correct
3 Correct 0 ms 1220 KB Output is correct
4 Correct 0 ms 1220 KB Output is correct
5 Correct 0 ms 1220 KB Output is correct
6 Correct 0 ms 1220 KB Output is correct
7 Correct 0 ms 1220 KB Output is correct
8 Correct 0 ms 1220 KB Output is correct
9 Correct 0 ms 1220 KB Output is correct
10 Correct 0 ms 1220 KB Output is correct
11 Correct 0 ms 1220 KB Output is correct
12 Correct 0 ms 1220 KB Output is correct
13 Correct 0 ms 1220 KB Output is correct
14 Correct 0 ms 1220 KB Output is correct
15 Correct 0 ms 1220 KB Output is correct
16 Correct 0 ms 1220 KB Output is correct
17 Correct 0 ms 1220 KB Output is correct
18 Correct 0 ms 1220 KB Output is correct
19 Correct 0 ms 1220 KB Output is correct
20 Correct 0 ms 1220 KB Output is correct
21 Correct 0 ms 1220 KB Output is correct
22 Correct 0 ms 1220 KB Output is correct
23 Correct 0 ms 1220 KB Output is correct
24 Correct 0 ms 1220 KB Output is correct
25 Correct 0 ms 1220 KB Output is correct