#define SIZE 10000
void addParenthesisRecursively(int left, int right, char* str, char**result, int* returnSize, int n) {
if((left == 0) && (right == 0))
result[(*returnSize)++] = str;
else {
char* newStr = (char *)malloc(sizeof(char) * (2*n+1));
if(left > 0) {
strcpy(newStr, str);
addParenthesisRecursively(left-1, right+1, strcat(newStr, "("), result, returnSize, n);
}
if(right > 0) {
strcpy(newStr, str);
addParenthesisRecursively(left, right-1, strcat(newStr, ")"), result, returnSize, n);
}
}
}
/**
* Return an array of size *returnSize.
* Note: The returned array must be malloced, assume caller calls free().
*/
char** generateParenthesis(int n, int* returnSize) {
char** result = (char **)malloc(sizeof(char *) * SIZE);
addParenthesisRecursively(n, 0, "", result, returnSize, n);
return result;
}
22 generate parentheses
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