Editorial for Chuyển đổi xâu

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Spoiler Alert

Hint 1

Duyệt qua mảng kí tự, nếu phần tử hiện

Reference AC code | O(n) time | O(n) auxiliary space | String

C++
int main()
{
    string s;
    getline(cin, s);
    int n = s.size();

    for (int i = 0; i < n; ++i)
    {
        char c = s[i];
        if ('a' <= c && c <= 'z') { cout << char(c - 32); continue; }
        if ('A' <= c && c <= 'Z') { cout << char(c + 32); continue; }    
        cout << c;
    }
    return 0;
}

Reference AC code | O(n) time | O(1) auxiliary space | String, Online Solving

C++
inline bool isValid(char c) { return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || (c == ' '); }
int main()
{
    for (char c; isValid(c = getchar()); cout << char(c == ' ' ? c : c ^ 32));
    return 0;
}

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