1296: [NOIP2002] Series summation T1

topic description

Known: Sn= 1+1/2+1/3+...+1/n. Obviously for any integer K, when n is large enough, Sn is greater than K. Now given an integer K (1<=k<=15), it is required to calculate a minimum n; make Sn>K.

enter

input k

output

output n

sample input

1

sample output

2

Above code:

#include <stdio.h>
int main()
{ 
double s = 0; 
int i;
int k; 
scanf("%d",&k); 
for(i = 1; ; i ++) 
{     s+=1.0/i; 
    if(s>k)
        break;
} 
printf("%d", i);
return 0;
 }

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