1614.Is It A Tree.cpp

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

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#include <iostream> using namespace std; int main() { int i,j,k,n,tem,root,a[10000],b[10000]; bool out, judge = false; for (n = 1;;n++) { for (i = 0;;i++) { cin >> a[i] >> b[i]; if (a[i]==0&&b[i]==0) break; if (a[i]==-1&&b[i]==-1) { judge = true; break; } } if (judge) break; if (i == 0&&a[0] != -1) { cout << "Case " << n << " is a tree.\n"; continue; } for (j = 0;j < i;j++) { out = false; if (a[j]==b[j]) { cout << "Case " << n << " is not a tree.\n"; out = true; break; } for (k = j+1;k < i;k++)
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