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  1. #include <stdio.h>
  2.  
  3. int sum(int m,int n){
  4. if(m==n) return n;
  5. else return m+sum(m+1,n);
  6. }
  7.  
  8. int main(void) {
  9. int a,b;
  10. scanf("%d %d",&a,&b);
  11. printf("%d",sum(a,b));
  12. return 0;
  13. }
  14.  
Success #stdin #stdout 0.01s 5284KB
stdin
1 3
stdout
6