[Ybtoj High-efficiency Advanced 2.1] [String] Number flip

[Ybtoj High-efficiency Advanced 2.1] [String] Number flip

topic

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Problem-solving ideas

Use string input
to reorganize a number backwards,
pay attention to the minus sign

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Code

#include<cstdio>
using namespace std;
int x,y;
string s;
int main()
{
    
    
	cin>>s;
	if (s[0]=='-') printf("-"),x++;
	for (int i=s.size()-1;i>=x;i--)
	    y=y*10+s[i]-48;
	printf("%d\n",y);
	return 0;
}