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151+reverseWords.cpp
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151+reverseWords.cpp
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class Solution {
public:
// 逆转字符串
void reverseS(string &s, int start, int end) {
for (int i = start, j = end; i < j; i++, j--) {
swap(s[i], s[j]);
}
}
// 去除多余的空格
void removeExtraSpaces(string& s) {
int slow = 0;
int fast = 0;
// 去除最前方的空格
while (s[fast] == ' ') {
fast++;
}
// 去除字符串中间的空格
for (; fast < s.size(); fast++) {
if (s[fast] == ' ' && s[fast - 1] == ' ') { //保证字符串尾部本不可能有大于1个的空格
continue;
} else {
s[slow] = s[fast];
slow++;
}
}
// 去除字符串最后的空格 最后可能是1个空格或者1个字母
if (s[slow - 1] == ' ') {
s.resize(slow - 1);
} else {
s.resize(slow);
}
}
// 解
string reverseWords(string s) {
removeExtraSpaces(s);
reverseS(s, 0, s.size() - 1);
int start = 0;
for (int i = 0; i < s.size(); i++) {
if (s[i] == ' ') {
reverseS(s, start, i - 1);
start = i + 1;
}
}
reverseS(s, start, s.size() - 1);
return s;
}
};