第5行:字符54:错误:没有用于调用"min(int,std :: __ cxx11 :: basic_string< char> :: size_type)"的匹配函数 [英] Line 5: Char 54: error: no matching function for call to 'min(int, std::__cxx11::basic_string<char>::size_type)'
问题描述
class Solution {
public:
string reverseStr(string s, int k) {
for (int start = 0; start < s.size(); start += 2 * k) {
int end = min(start + k - 1, s.size() - 1);
while (start < end) {
swap(s[start], s[end]);
start++;
end--;
}
}
return s;
}
};
第5行:字符54:错误:没有用于调用'min(int,std :: __ cxx11 :: basic_string :: size_type)'的匹配函数
Line 5: Char 54: error: no matching function for call to 'min(int, std::__cxx11::basic_string::size_type)'
推荐答案
编译器试图告诉您,问题是 start + k -1
和 s的类型.size()-1
是不同的.因此,解决此问题的一种方法是将 start
和 k
的类型更改为 std :: size_t
:
As the compiler tries to tell you, the issue is that the types of start + k -1
and s.size() - 1
are different. So one way to fix this is to change the types of start
and k
to std::size_t
:
std::string reverseStr(std::string s, std::size_t k) {
for (std::size_t start = 0; start < s.size(); start += 2 * k) {
std::size_t end = std::min(start + k - 1, s.size() - 1);
while (start < end) {
swap(s[start], s[end]);
start++;
end--;
}
}
return s;
}
或者,您也可以将 s.size()-1
强制转换为 int
:
Alternatively you can just cast s.size() - 1
to int
:
int end = std::min(start + k - 1, static_cast<int>(s.size() - 1));
还有第三种方法来显式指定 std :: min
的模板参数,但是这可能会触发编译器的有符号/无符号/无符号/有符号转换警告:
There is also the third way to explicitly specify the template parameter of std::min
, but that might trigger signed-to-unsigned / unsigned-to-signed conversion warnings of your compiler:
int end = std::min<int>(start + k - 1, s.size() - 1);
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