测试点 题目传送门

#include<bits/stdc++.h>
using namespace std;
int main() {
	int n, a,b=0;
	cin >> n;
	if (n > 0) {
		while (n) {
			a = n % 10;
			n /= 10;
			if(a!=0&b!=0)cout << a;
			else b++;
		}
	} else {
		if (n == 0) {
			cout << 0;
		} else {
			cout << "-";
			n = abs(n);
			while (n) {
				a = n % 10;
				n /= 10;
					if(a!=0&b!=0)cout << a;
							else b++;
			}
		}
	}
	return 0;
}