#include<bits/stdc++.h> using namespace std; int main() { int n; cin >> n; if(n == 0){ cout << 0; return 0; } int a[32] = {0}; // 将数组全部清0 int cnt = 0; while(n != 0) { a[cnt++] = n % 2; n /= 2; } for(int i = cnt-1; i >= 0; i--) { cout << a[i]; } return 0; }