#include <stdio.h>
int smaller_index(int arr[], int pos) {
int index = -1;
for (int i = pos - 1; i >= 0 && index==-1; i--) {
if (arr[i] < arr[pos]) {
index = i;
}
}
return index;
}
void nearest_smaller(int arr[], int size) {
int index = 0;
for (int i = 0; i < size; i++) {
index = smaller_index(arr, i);
if (index == -1) {
printf("%d : No Smaller\n", arr[i] );
}
else {
printf("%d : %d\n",arr[i], arr[index]);
}
}
}
int main()
{
int arr[] = {4, 6, 2, 8, 6, 1, 9, 12, 3, 20, 18, 30};
int size = sizeof(arr) / sizeof(arr[0]);
nearest_smaller(arr, size);
return 0;
}
/*
run:
4 : No Smaller
6 : 4
2 : No Smaller
8 : 2
6 : 2
1 : No Smaller
9 : 1
12 : 9
3 : 1
20 : 3
18 : 3
30 : 18
*/
