arrays - Scanf error in C -

so have following c code:

#include<stdio.h> #include<stdlib.h>  int main() {     int l,r;     scanf("%d",&l);     scanf("%d",&r);      long long int *a=malloc(l*sizeof(long long int*));     long long int *a=malloc(l*sizeof(long long int*));       int i;      for(i=0;i<l;i++)             scanf("%lld %lld",&a[i],&a[i]);       for(i=0;i<l;i++)     {             printf("a(%d)==%lld , a(%d)==%lld\n",i,a[i],i,a[i]);     }      return 0;     } 

which unfortunately starter of problem, , print loop on end want determine if input values assigned correctly arrays , ( r value has 2 arrays b , b doesn't matter).

when compile , run program these inputs: 3 5 10 1 3 2 10 1

i on output: a(0)==10 , a(0)==10 a(1)==3 , a(1)==2 a(2)==10 , a(2)==1

notice puts correctly, value a(0)=10 instead of calculated 1 , scanf reads second time value 10, skips value 1 , proceeds reading rest of values correctly. i'm stuck. have idea why incident occurs?

there mistake in following line:

long long int *a=malloc(l*sizeof(long long int*)); 

you need use sizeof(long long int) , not sizeof(long long int*)

hope helps mitigate issues.