poj1988_Cube Stacking
Posted 多一份不为什么的坚持
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Cube Stacking
Time Limit: 2000MS | Memory Limit: 30000K | |
Total Submissions: 24130 | Accepted: 8468 | |
Case Time Limit: 1000MS |
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.
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.
* 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
唉,一个并查集的题,改了好久。。。终于a了。
1 #include <iostream> 2 #include <cstdio> 3 #include <cstring> 4 5 using namespace std; 6 7 int up[300005];//该数上面的数 8 int n[300005];//该集合总数 9 int a[300005];//保存他的父节点 10 11 int father(int t){ 12 if(t==a[t]){ 13 return t; 14 } 15 int fa=a[t]; 16 a[t]=father(a[t]); 17 up[t]+=up[fa]; 18 19 return a[t]; 20 } 21 22 int main() 23 { 24 int p; 25 //char c; 26 int t1,t2; 27 int t3; 28 while(scanf("%d",&p)!=EOF){ 29 for(int i=0;i<=p;i++){ 30 a[i]=i; 31 up[i]=0; 32 n[i]=1; 33 } 34 char s[10]; 35 for(int i=0;i<p;i++){ 36 scanf("%s",s); 37 if(s[0]==‘M‘){ 38 scanf("%d%d",&t1,&t2); 39 int fa=father(t1); 40 int fb=father(t2); 41 if(fa!=fb){ 42 a[fb]=fa; 43 up[fb]+=n[fa]; 44 n[fa]+=n[fb]; 45 } 46 }else{ 47 scanf("%d",&t3); 48 int ans=father(t3); 49 printf("%d\n",n[ans]-up[t3]-1); 50 } 51 } 52 } 53 return 0; 54 }
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