Time: 3 ms (98.17%), Space: 7.2 MB (14.21%) - LeetHub

412-fizz-buzz/412-fizz-buzz.c

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+/**
+ * Note: The returned array must be malloced, assume caller calls free().
+ */
+char ** fizzBuzz(int n, int* returnSize){
+    char **array = malloc(n * sizeof(char *));
+    *returnSize = n;
+    
+    for (int i = 1; i <= n; ++i) {
+        if (i % 15 == 0) {
+            array[i - 1] = "FizzBuzz";
+        } else if (i % 3 == 0) {
+            array[i - 1] = "Fizz";
+        } else if (i % 5 == 0) {
+            array[i - 1] = "Buzz";
+        } else {
+            array[i - 1] = malloc((int) (ceil(log10(i + 1)) + 1) * sizeof(char));
+            sprintf(array[i - 1], "%d", i);
+        }
+    }
+    
+    return array;
+    
+}