排除一样的元素在c语言中

int main(){
int a[11];
int b[11];
int i;
int j;
printf("input the a[]:n");
for(i=0;i<11;i++){
scanf("%d",&a[i]);
printf("");
}

printf("input the b[]:n");
for(i=0;i<11;i++){
scanf("%d",&b[i]);
printf("");
}
int common=1000;

for(i=0;i<11;i++){
    for(j=0;j<11;j++){
 if(a[i]==b[j]){

     a[i]=common;
 }
 if(a[j]==b[i]){
     b[i]=common;
 }
    }
}
int record=0;
    //sum the zero number
 //remove the unnecessary zero
for(j=0;j<11;j++){
    if(a[j]!=common){
 record++;
    }

}
int share[record];
int test=0;
for(j=0;j<11;j++){
    if(a[j]!=common){
     share[test]=a[j];
     test++;
    }

}
//prevent the same number exist in the share
int recordsec=0;//record the repeat number
for(i=0;i
}