#include fun(int x) {if(x/2>0)fun(x/2) printf("%d",x%2); } main() {fun(20);putchar('\n');}

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#include fun(int x) {if(x/2>0)fun(x/2) printf("%d",x%2); } main() {fun(20);putchar('\n');}
#include fun(int x) {if(x/2>0)fun(x/2) printf("%d",x%2); } main() {fun(20);putchar('\n');}

#include fun(int x) {if(x/2>0)fun(x/2) printf("%d",x%2); } main() {fun(20);putchar('\n');}
fun(20){
fun(10){
fun(5){
fun(2){
fun(1){
输出1}
输出0}
输出1}
输出0}
输出0}