StackString
Ek string `s` diya gaya hai jisme sirf `(`, `)`, `{`, `}`, `[`, `]` characters hain. Check karo ki string valid hai ya nahi.
Input: s = "()"
Output: true
Opening aur closing match karte hain.
Input: s = "()[]{}"
Output: true
Teeno pairs sahi order mein hain.
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