题解 | #反转字符串#
反转字符串
http://www.nowcoder.com/practice/c3a6afee325e472386a1c4eb1ef987f3
首尾交换，直到中间下标处
class Solution {
public:
string solve(string str) {
int len = str.size();
for(int i=0; i<len/2; ++i){
char t = str[i];
str[i] = str[len-1-i];
str[len-1-i] = t;
}
return str;
}
};双下标
class Solution {
public:
string solve(string str) {
int i=0, j=str.size()-1;
while(i<j){
char t = str[i];
str[i] = str[j];
str[j] = t;
++i;--j;
}
return str;
}
};
