# include & lt; stdio.h> 

Int is_prime (int n) 
{
For (int j=2; J * j & lt;=n; J++) 
{
If (n % j==0) 
{
return 0; 
} 
} 
return 1; 
} 

Int main (void) 
{
Int n, m, I, s=0, a=0; 

The scanf (" % d % d ", & amp; N, & amp; M); 

For (I=2; I & lt;=200; I++) 
{
If (is_prime (I)) 
{
S++; 
If (s & gt;=n & amp; & S & lt;=m) 
{
A +=I; 
} 
} 
If (s & gt;=m) 
break; 
} 

Printf (" % d ", a); 
return 0; 
} 

To China university mooc submitted above, five cases only by a new one, but I run once, result is no problem ah, don't know where your code has a problem, ask bosses to help have a look,

CodePudding user response:

The meaning of the 200 is the 200th prime, it's not really 200 this value,