Add 118 in c language

Author: julienChemillier

c/118-Pascals-triangle.c

@@ -0,0 +1,24 @@
+/*
+Given an integer numRows, return the first numRows of Pascal's triangle.
+
+Space: O(n²) (n=numRows)
+Time: O(n²)
+*/
+
+int** generate(int numRows, int* returnSize, int** returnColumnSizes){
+    *returnSize = numRows;
+    (*returnColumnSizes) = malloc(sizeof(int*)*numRows);
+    int** ans = malloc(sizeof(int*)*numRows);
+    for (int i=0; i<numRows; i++) {
+        (*returnColumnSizes)[i] = i+1;
+        ans[i] = malloc(sizeof(int)*(i+1));
+        ans[i][0] = 1;
+        ans[i][i] = 1;
+    }
+    for (int i=2; i<numRows; i++) {
+        for (int j=1; j<i; j++) {
+            ans[i][j] = ans[i-1][j-1] + ans[i-1][j];
+        }
+    }
+    return ans;
+}