POJ 1988 Cube Stacking
2014-09-05 11:35
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题目来源:http://poj.org/problem?id=1988
Cube Stacking
Description
Farmer John and Betsy are playing a game with N (1 <= N <= 30,000)identical cubes labeled 1 through N. They start with N stacks, each containing a single cube. Farmer John asks Betsy to perform P (1<= P <= 100,000) operation. There are two types of operations:
moves and counts.
* In a move operation, Farmer John asks Bessie to move the stack containing cube X on top of the stack containing cube Y.
* In a count operation, Farmer John asks Bessie to count the number of cubes on the stack with cube X that are under the cube X and report that value.
Write a program that can verify the results of the game.
Input
* Line 1: A single integer, P
* Lines 2..P+1: Each of these lines describes a legal operation. Line 2 describes the first operation, etc. Each line begins with a 'M' for a move operation or a 'C' for a count operation. For move operations, the line also contains two integers: X and Y.For
count operations, the line also contains a single integer: X.
Note that the value for N does not appear in the input file. No move operation will request a move a stack onto itself.
Output
Print the output from each of the count operations in the same order as the input file.
Sample Input
Sample Output
Source
USACO 2004 U S Open
题解: 向量并查集~~~ 与Vijos 1443 银河英雄传说无异~~ 这次真爽,一遍打下来没有任何修改就AC了。
AC代码:
Cube Stacking
Time Limit: 2000MS | Memory Limit: 30000K | |
Total Submissions: 19173 | Accepted: 6693 | |
Case Time Limit: 1000MS |
Farmer John and Betsy are playing a game with N (1 <= N <= 30,000)identical cubes labeled 1 through N. They start with N stacks, each containing a single cube. Farmer John asks Betsy to perform P (1<= P <= 100,000) operation. There are two types of operations:
moves and counts.
* In a move operation, Farmer John asks Bessie to move the stack containing cube X on top of the stack containing cube Y.
* In a count operation, Farmer John asks Bessie to count the number of cubes on the stack with cube X that are under the cube X and report that value.
Write a program that can verify the results of the game.
Input
* Line 1: A single integer, P
* Lines 2..P+1: Each of these lines describes a legal operation. Line 2 describes the first operation, etc. Each line begins with a 'M' for a move operation or a 'C' for a count operation. For move operations, the line also contains two integers: X and Y.For
count operations, the line also contains a single integer: X.
Note that the value for N does not appear in the input file. No move operation will request a move a stack onto itself.
Output
Print the output from each of the count operations in the same order as the input file.
Sample Input
6 M 1 6 C 1 M 2 4 M 2 6 C 3 C 4
Sample Output
1 0 2
Source
USACO 2004 U S Open
题解: 向量并查集~~~ 与Vijos 1443 银河英雄传说无异~~ 这次真爽,一遍打下来没有任何修改就AC了。
AC代码:
#include<cstdio> const int Max=30001; int father[Max],loc[Max],root[Max],t,x,y; char ch; int find(int k){ if(k==father[k]) return k; int temp=find(father[k]); loc[k]+=loc[father[k]]; father[k]=temp; return temp; } int main(){ scanf("%d",&t); for(int i=1;i<Max;i++){ father[i]=i;loc[i]=0;root[i]=1; } while(t--){ getchar(); scanf("%c",&ch); if(ch=='M'){ scanf("%d%d",&x,&y); int tempx=find(x),tempy=find(y); father[tempy]=tempx; loc[tempy]=root[tempx]; root[tempx]+=root[tempy]; } else { scanf("%d",&x); int tempx=find(x); printf("%d\n",root[tempx]-loc[x]-1); } } return 0; }
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