针对输入的N个字符串，输出其中最长的字符串 使用int max len

#include <iostream>
#include <string>
using namespace std;

int main() {
int N, max_len = 0;
string str, longest_str;

cout << "请输入字符串个数N：" << endl;
cin >> N;

for (int i = 0; i < N; i++) {
cout << "请输入第" << i+1 << "个字符串：" << endl;
cin >> str;
if (str.length() > max_len) {
max_len = str.length();
longest_str = str;
}
}

cout << "最长的字符串是：" << longest_str << endl;
cout << "长度为：" << max_len << endl;

return 0;
}