string--OJ3

链接: li1

#include <iostream>
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;}
};