#include <stdio.h>
int main(void) {
int a = 0, k = 0;
int res = 0;
res = 1;
while(k > 0){
if (k%2 == 0){
res = res*res;
k = k/2;
}else {
res = res * a;
k = k - 1;
}
}
return 0;
}
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