题意:
有n个龙珠,分别存放在编号为1-n的城市里面。然后进行如下操作,T,a,b将a龙珠所在城市的所有龙珠都转移到b龙珠所在的城市,Q,a输出a龙珠所在的城市,以及该城市一共有多少个龙珠,同时输出该龙珠被转移的次数,
思路:
并查集,前两项比较好像,后一项记录转移次数,我们只需要记录每一个点到达父节点所需的转移次数no[i]然后再路径压缩的时候求一个和,压缩完成后该点的no值就是该点的转移次数了。
#include <iostream> #include <cstdio> #include <cmath> #include <vector> #include <cstring> #include <algorithm> #include <string> #include <set> #include <functional> #include <numeric> #include <sstream> #include <stack> #include <map> #include <queue> #define CL(arr, val) memset(arr, val, sizeof(arr)) #define lc l,m,rt<<1 #define rc m + 1,r,rt<<1|1 #define pi acos(-1.0) #define ll __int64 #define L(x) (x) << 1 #define R(x) (x) << 1 | 1 #define MID(l, r) (l + r) >> 1 #define Min(x, y) (x) < (y) ? (x) : (y) #define Max(x, y) (x) < (y) ? (y) : (x) #define E(x) (1 << (x)) #define iabs(x) (x) < 0 ? -(x) : (x) #define OUT(x) printf("%I64d\n", x) #define lowbit(x) (x)&(-x) #define Read() freopen("din.txt", "r", stdin) #define Write() freopen("dout.txt", "w", stdout); #define M 30007 #define N 10007 using namespace std; const int inf = 100000007; const int mod = 1000000007; int f[N]; int no[N],tim[N]; int n,m; void init() { for (int i = 0; i <= n; ++i) { f[i] = i; no[i] = 1; tim[i] = 0; } } int find(int x) { if (f[x] != x) { int fa = find(f[x]); tim[x] += tim[f[x]]; f[x] = fa; } return f[x]; } void Union(int x,int y) { x = find(x); y = find(y); if (x != y) { f[x] = y; no[y] += no[x]; tim[x]++; } } int main() { // Read(); int T; char op[2]; int cas = 1; scanf("%d",&T); while (T--) { printf("Case %d:\n",cas++); scanf("%d%d",&n,&m); init(); while (m--) { scanf("%s",op); int x,y; if (op[0] == 'T') { scanf("%d%d",&x,&y); Union(x,y); } else { scanf("%d",&x); int rt = find(x); printf("%d %d %d\n",rt,no[rt],tim[x]); } } } return 0; }