# I get the right answer using example. But it can't be accepted and get runtime error. Why?

• ``````#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#define max(a, b) (a > b ? a : b)
struct TreeNode
{
int val;
struct TreeNode *left;
struct TreeNode *right;
};
int maxDepth(struct TreeNode* root)
{
if (!root) return 0;
else
{
int L = maxDepth(root->left);
int R = maxDepth(root->right);
return 1 + max(L, R);
}
}

int** pathSum(struct TreeNode* root, int sum, int** columnSizes, int* returnSize)
{
if (!root) return NULL;
int depth = maxDepth(root);
int** reArray = malloc(sizeof(int*) * pow(2, depth));
int* count = malloc(sizeof(int) * pow(2, depth));
int stackNum = 0;

if (root->left)
{
int** reTmp;
int* colTmp;
int sizeTmp;

reTmp = pathSum(root->left, (sum - root->val), &colTmp, &sizeTmp);
for (int i = 0; i < sizeTmp; i++)
{
reArray[stackNum + i] = malloc(sizeof(int*) * (colTmp[i] + 1));
count[stackNum + i] = colTmp[i] + 1;
reArray[stackNum + i][0] = root->val;
for (int j = 0; j < colTmp[i]; j++)
{
reArray[stackNum + i][j + 1] = reTmp[i][j];
}
}
free(reTmp);
free(colTmp);
stackNum += sizeTmp;
}
if (root->right)
{
int** reTmp;
int* colTmp;
int sizeTmp;

reTmp = pathSum(root->right, (sum - root->val), &colTmp, &sizeTmp);
for (int i = 0; i < sizeTmp; i++)
{
reArray[stackNum + i] = malloc(sizeof(int*) * (colTmp[i] + 1));
count[stackNum + i] = colTmp[i] + 1;
reArray[stackNum + i][0] = root->val;
for (int j = 0; j < colTmp[i]; j++)
{
reArray[stackNum + i][j + 1] = reTmp[i][j];
}
}
free(reTmp);
free(colTmp);
stackNum += sizeTmp;
}
if (!root->left && !root->right)
{
if (root->val == sum)
{
reArray[0] = malloc(sizeof(int));
reArray[0][0] = root->val;
stackNum = 1;
count[0] = 1;
}
else
{
reArray[0] = NULL;
stackNum = 0;
count[0] = 0;
}
}
*returnSize = stackNum;
*columnSizes = count;
return reArray;
}

int main()
{
struct TreeNode* a1 = malloc(sizeof(struct TreeNode));

struct TreeNode* b1 = malloc(sizeof(struct TreeNode));
struct TreeNode* b2 = malloc(sizeof(struct TreeNode));

struct TreeNode* c1 = malloc(sizeof(struct TreeNode));
struct TreeNode* c2 = malloc(sizeof(struct TreeNode));
struct TreeNode* c3 = malloc(sizeof(struct TreeNode));

struct TreeNode* d1 = malloc(sizeof(struct TreeNode));
struct TreeNode* d2 = malloc(sizeof(struct TreeNode));
struct TreeNode* d3 = malloc(sizeof(struct TreeNode));
struct TreeNode* d4 = malloc(sizeof(struct TreeNode));

a1->val = 5;
a1->left = b1;
a1->right = b2;

b1->val = 4;
b1->left = c1;
b1->right = NULL;
b2->val = 8;
b2->left = c2;
b2->right = c3;

c1->val = 11;
c1->left = d1;
c1->right = d2;
c2->val = 13;
c2->left = NULL;
c2->right = NULL;
c3->val = 4;
c3->left = d3;
c3->right = d4;

d1->val = 7;
d1->left = NULL;
d1->right = NULL;
d2->val = 2;
d2->left = NULL;
d2->right = NULL;
d3->val = 5;
d3->left = NULL;
d3->right = NULL;
d4->val = 1;
d4->left = NULL;
d4->right = NULL;

int* col;
int size;
int** re;
re = pathSum(a1, 22, &col, &size);
for (int i = 0; i < size; i++)
{
for (int j = 0; j < col[i]; j++)
{
printf("%d	", re[i][j]);
}
printf("\n");
}
}
``````

I get the right answer using example. But it can't be accepted and get runtime error. Why?

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