[AcWing 768] 忽略大小写比较字符串大小

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点击查看代码

#include<iostream>

using namespace std;

string a, b;
int main()
{
    getline(cin, a);
    getline(cin, b);
    for (char& c : a)    c = tolower(c);
    for (char& c : b)    c = tolower(c);
    if (a < b)  puts("<");
    else if (a > b) puts(">");
    else    puts("=");
    return 0;
}

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将字符串 s 转化为小写的简短写法：

1. for ( char & c : s ) c = tolower(c);
2. transform( s.begin(), s.end(), s.begin(), ::tolower );