hdu4430Yukari's Birthday(二分）

4430

去年长春最简单一题 二分啊 错了好多遍  有个大坑 是个圆心处的1  可选可不选

 1 #include <iostream>

 2 #include<cstdio>

 3 #include<cstring>

 4 #include<algorithm>

 5 #include<stdlib.h>

 6 #include<cmath>

 7 using namespace std;

 8 #define LL __int64

 9 LL s;

10 int main()

11 {

12     int i,j;

13     while(scanf("%I64d",&s)!=EOF)

14     {

15         LL maxz = s-1,m1 = 1,m2 = s-1;

16         for(i = 2; i <= 40 ; i++)

17         {

18             LL low = 1,high = s,m;

19             double ty = 1,ts=0;

20             while(low<=high)

21             {

22                 m = (low+high)/2;

23                 ts = 0,ty=1;

24                 for(j = 0 ; j <= i ; j++)

25                 {

26                     ts+=ty;

27                     ty*=m;

28                     if(ts>s) break;

29                 }

30                 if(ts>s)

31                 high = m-1;

32                 else if(ts<s)

33                 low = m+1;

34                 else break;

35             }

36             if(s==ts&&maxz>i*m)

37             {

38                 maxz = i*m;

39                 m1 = i;

40                 m2 = m;

41             }

42             low = 1,high = s,ts=0,ty=1;

43             while(low<=high)

44             {

45                 m = (low+high)/2;

46                 ts = 0,ty=m;

47                 for(j = 1 ; j <= i ; j++)

48                 {

49                     ts+=ty;

50                     ty*=m;

51                     if(ts>s) break;

52                 }

53                 if(ts>s)

54                 high = m-1;

55                 else if(ts<s)

56                 low = m+1;

57                 else break;

58             }

59             if(s==ts&&maxz>i*m)

60             {

61                 maxz = i*m;

62                 m1 = i;

63                 m2 = m;

64             }

65         }

66         printf("%I64d %I64d\n",m1,m2);

67     }

68     return 0;

69 }

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