【leetcode】Valid Parentheses
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Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.
bool isValid(char *s) { const int size = 10000; char stack[size]; int p = 0; for (; *s != '\0'; ++s) { switch (*s) { case ')': if (p == 0 || stack[p - 1] != '(') { return false; } --p; break; case ']': if (p == 0 || stack[p - 1] != '[') { return false; } --p; break; case '}': if (p == 0 || stack[p - 1] != '{') { return false; } --p; break; default: stack[p++] = *s; } // switch } return p == 0;} 0 0
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