string--OJ3

链接: li1

#include 
using namespace std;

int main() {
    string a;
    getline(cin, a);
    cout << a.size() - a.find_last_of(" ")-1;
     {

     }

}

链接: li2

class Solution {
public:
    bool isPalindrome(string s) {
   for (int i = 0; i < s.size(); i++)
 {
     if (s[i] >= 'A' && s[i] <= 'Z')
     {
         s[i] += 'a' - 'A';
     }
     else if ((s[i] >= '0' && s[i] <= '9') || s[i] >= 'a' && s[i] <= 'z')
     {

     }
     else
     {
         s.erase(i, 1);
         i--;
     }
         
 }
 string s1 = s;
 reverse(s1.begin(), s1.end());
       return s1==s; 
    }
};

链接: li3

class Solution {
public:
    string reverseStr(string s, int k) {
    int K = 2*k;
    string::iterator b = s.begin();
    while (K <= s.size()) 
    {
        reverse(b,b+k);
        b += 2 * k;
        K += 2*k;
    }

    reverse(b, s.end()<(b+k)?s.end():(b+k));
    return s;
    }
};