1614. Is It A Tree.cpp

1614. Is It A Tree.cpp - #include#include...

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#include<iostream> #include <stdio.h> using namespace std; const int Max = 105; int parent[Max]; bool flag[Max]; void make_set(){ for(int x = 1; x < 100; x ++){ parent[x] = x; flag[x] = false; } } int find_set(int x){ if(x != parent[x]) parent[x] = find_set(parent[x]); return parent[x]; } void union_set(int x, int y){ x = find_set(x); y = find_set(y); if(x == y) return; parent[y] = x; } int main(){ int x, y, t = 1, fir; while(scanf("%d %d", &x, &y) != EOF){ if(x == -1 && y == -1) break; if(x == 0 && y == 0){ // ?1???: ??????? printf("Case %d is a tree.\n", t ++); continue;
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