码题集OJ-恢复乘法表 (matiji.net)

思想

这道题我就用一个指针从头走到尾做的:

#include<bits/stdc++.h> 
#define int long long
using namespace std;
signed main()
{
	cin.tie(nullptr)->sync_with_stdio(0);	
	string s;cin>>s;
	
	string s1,s2;
    int i=0;
    while(s[i]!='*')
    {
			s1+=s[i];
			i++; 
	}
	
    char op=s[i];
	i++;

	while(i<s.size())
	{
	 	s2+=s[i];
	 	i++;
	} 
	
	int t1=stoi(s1);
	int t2=stoi(s2);
	
	cout<<t1*t2;
	return 0;
}

评论区更简单的做法: