#include <stdio.h>
int main(void) {
int head = 0;
int tail = 6;
int key = 17;
int Array[] = {7, 12, 6, 5, 11, 10, 13};
while (head < tail) {
head++;
if (Array[head] == key)
break;
}
if (head == tail) {
}
return 0;
}
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