H - The Falling Leaves

Description

Each year, fall in the North Central region is accompanied by the brilliant colors of the leaves on the trees, followed quickly by the falling leaves accumulating under the trees. If the same thing happened to binary trees, how large would the piles of leaves become?

We assume each node in a binary tree "drops" a number of leaves equal
to the integer value stored in that node. We also assume that these
leaves drop vertically to the ground (thankfully, there's no wind to
blow them around). Finally, we assume that the nodes are positioned
horizontally in such a manner that the left and right children of a node
are exactly one unit to the left and one unit to the right,
respectively, of their parent. Consider the following tree:

The nodes containing 5 and 6 have the same horizontal position (with
different vertical positions, of course). The node containing 7 is one
unit to the left of those containing 5 and 6, and the node containing 3
is one unit to their right. When the "leaves" drop from these nodes,
three piles are created: the leftmost one contains 7 leaves (from the
leftmost node), the next contains 11 (from the nodes containing 5 and
6), and the rightmost pile contains 3. (While it is true that only leaf
nodes in a tree would logically have leaves, we ignore that in this
problem.)

Input

The input contains multiple test cases, each describing a single tree. A
tree is specified by giving the value in the root node, followed by the
description of the left subtree, and then the description of the right
subtree. If a subtree is empty, the value -1 is supplied. Thus the tree shown above is specified as 5 7 -1 6 -1 -1 3 -1 -1. Each actual tree node contains a positive, non-zero value. The last test case is followed by a single -1 (which would otherwise represent an empty tree).

Output

For each test case, display the case number (they are numbered
sequentially, starting with 1) on a line by itself. On the next line
display the number of "leaves" in each pile, from left to right, with a
single space separating each value. This display must start in column 1,
and will not exceed the width of an 80-character line. Follow the
output for each case by a blank line. This format is illustrated in the
examples below.

Sample Input

5 7 -1 6 -1 -1 3 -1 -1
8 2 9 -1 -1 6 5 -1 -1 12 -1
-1 3 7 -1 -1 -1
-1

Sample Output

Case 1:
7 11 3

Case 2:
9 7 21 15

 #include <iostream>
 #include <cstdio>
 #include <cstring>
 #include <cmath>
 #include <algorithm>
 #include <string>
 #include <vector>
 #include <stack>
 #include <queue>
 #include <set>
 #include <map>
 #include <list>
 #include <iomanip>
 #include <cstdlib>
 #include <sstream>
 using namespace std;
 const int INF=0x5fffffff;
 const double EXP=1e-;
 const int mod=;
 const int MS=;

 int sum[MS];
 void build(int p)
 {
     int v;
     cin>>v;
     if(v==-)
         return ;
     sum[p]+=v;
     build(p-);
     build(p+);
 }
 bool init()
 {
     int v;
     cin>>v;
     if(v==-)
         return false;
     int p=MS/;
     memset(sum,,sizeof(sum));
     sum[p]+=v;
     build(p-);
     build(p+);
     return true;
 }

 int main()
 {
     int kase=;
     while(init())
     {
         int p=;
         while(sum[p]==)
             p++;
         cout<<"Case "<<++kase<<":"<<endl<<sum[p++];
         while(sum[p])
             cout<<" "<<sum[p++];
         cout<<endl<<endl;
     }
     return ;
 }