https://leetcode.com/problems/valid-parentheses


General Solution But Time Out


bool isValid(char* s) {
    char *memory_string = malloc(sizeof(char) * INT_MAX);
    int memory_index = 0;

    bool process_start = false;

    for (int index = 0; s[index] != '\0'; index = index + 1) {
        char character = s[index];
        if ((character == '(') || (character == '{') || (character == '[')) {
            if (character == '(') {
                memory_string[memory_index] = ')';
            } else if (character == '{') {
                memory_string[memory_index] = '}';
            } else if (character == '[') {
                memory_string[memory_index] = ']';
            }
            memory_index += 1;

            process_start = true;
        } else if ((character == ')') || (character == '}') || (character == ']')) {
            if (process_start == false) {
                return false;
            }

            if ((memory_index-1) >= 0) {
                if (character == memory_string[memory_index-1]) {
                    // get the right ending symbol, delete its pair character in memory
                    memory_string[memory_index-1] = '\0';
                    memory_index -= 1;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        } else {
            // ignore general other characters
        }
    }

    if (memory_index == 0) {
        return true;
    } else {
        return false;
    }

    return false;
}