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整理一下facebook见过的面经

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NeptuneFrank 发表于 2015-10-19 03:35:29 | 显示全部楼层 |阅读模式

2015(1-3月) 码农类 硕士 全职@Facebook - 内推 - 技术电面 |Pass在职跳槽

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1.+2 3 sum. 1point 3acres 璁哄潧

.鐣欏璁哄潧-涓浜-涓夊垎鍦
2. Given set of points in 2d grid space. Find a grid point such that sum 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
of distance from all the points to this common point is minimum.

. 1point3acres.com/bbs3. Print a binary tree by vertical level order-google 1point3acres

4. Calculate the average of each level of a tree.

5. how do you find the lowest common ancestor of two nodes in a binary tree

6. ??
1--a
2--b
...
26--z
鏉ユ簮涓浜.涓夊垎鍦拌鍧. given a digit , return the count of the possible output. 1point3acres.com/bbs
eg. '1313' --- 4
acac mac mm acm
'101' --1
ja
cannot discard any digit .



7.Given a matrix, calculate the sum of a sub matrix given the start and end indices of the sub matrix (do dynamical programming on this)

8. sort 3 color in array (use self-over writing with two ends.).
. 鍥磋鎴戜滑@1point 3 acres
.1point3acres缃
9.+1 implement sqrt() with integer (use Binary Search.)

10. find if one string is one edit distance away from the other string (check all possible cases)
. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
11. get the n-th Fibonacci number

12. find the depth of a binary tree,


13. merge two arrays, A + B -> A ( do it in-place, i feel. Why do not you merge sorted arrays from their largest element? (from max instead? very good question))
. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴

14. Check to see if one array is a subset of another.. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴

15. balance trees with weight???

16. add binary(leetcode)

17.+1 binary tree print all paths from root to leef.1point3acres缃
How to do it iteratively? 用一个stack实现preorder来做?
.鐣欏璁哄潧-涓浜-涓夊垎鍦
/*
Given a binary tree, print out all of its root-to-leaf
paths, one per line. Uses a recursive helper to do the work.
*/
void printPaths(struct node* node) {
  int path[1000];.鏈枃鍘熷垱鑷1point3acres璁哄潧
  printPathsRecur(node, path, 0);.1point3acres缃
}

/*
Recursive helper function -- given a node, and an array containing. visit 1point3acres.com for more.
the path from the root node up to but not including this node,
print out all the root-leaf paths.
*/ 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
void printPathsRecur(struct node* node, int path[], int pathLen) {.鐣欏璁哄潧-涓浜-涓夊垎鍦
  if (node==NULL) return;

  // append this node to the path array
  path[pathLen] = node->data;
  pathLen++;
. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴
  // it's a leaf, so print the path that led to here
  if (node->left==NULL && node->right==NULL) {
    printArray(path, pathLen);
  }
  else {
  // otherwise try both subtrees
    printPathsRecur(node->left, path, pathLen);
    printPathsRecur(node->right, path, pathLen);
  }
}

// Utility that prints out an array on a line.. 涓浜-涓夊垎-鍦帮紝鐙鍙戝竷
void printArray(int ints[], int len) {
  int i;
  for (i=0; i<len; i++) {
    printf("%d ", ints);
  }
  printf("\n");.1point3acres缃
}

. more info on 1point3acres.com
18. clone graph

19. count and say(leetcode)

20. Divide without division. 鍥磋鎴戜滑@1point 3 acres
. 1point 3acres 璁哄潧
鏉ユ簮涓浜.涓夊垎鍦拌鍧.
21. Big Integer multiplication. (optimization required, how to do 8 digits*8 digits, etc).. 1point 3acres 璁哄潧



23.+1 Push all the zero's of a given array to the end of the array. In place only. Ex 1,2,0,4,0,0,8 becomes 1,2,4,8,0,0,0.鏈枃鍘熷垱鑷1point3acres璁哄潧

. 鍥磋鎴戜滑@1point 3 acres
24. You're given an array of integers(eg [3,4,7,1,2,9,8]) Find the index of values that satisfy A+B = C + D, where A,B,C & D are integers values in the array.
. 涓浜-涓夊垎-鍦帮紝鐙鍙戝竷
Eg: Given [3,4,7,1,2,9,8] array. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
The following
3+7 = 1+ 9 satisfies A+B=C+D. 1point 3acres 璁哄潧
so print (0,2,3,5)


25. Find intersection of 2 sorted arrays.



. Waral 鍗氬鏈夋洿澶氭枃绔,


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 楼主| NeptuneFrank 发表于 2015-10-19 03:36:05 | 显示全部楼层
highlight的是见过多次的
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