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  1. #include <stdio.h>
  2. int sum(int n,int m)
  3. {
  4. if(n-1==m)
  5. return m;
  6. else
  7. return n+sum(n,n-1);
  8. }
  9.  
  10. int main(void) {
  11. int a,b;
  12.  
  13. scanf("%d %d",&a,&b);
  14. printf("%d",sum(a,b));
  15. return 0;
  16. }
  17.  
Success #stdin #stdout 0s 5316KB
stdin
10 2
stdout
19