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- #include <stdio.h>
- long long power(int a, int b){
- long long ans = 1;
- for(int i = 0; i < b; i++){
- ans *= a;
- }
- return ans;
- }
- int main(){
- int n;
- long long s = 0;
- scanf("%d", &n);
- int i = 0;
- while(n > 0){
- s += (n%2)*power(10, i);
- n /= 2;
- i++;
- }
- printf("%lld\n", s);
- return 0;
- }
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