【題解】ZeroJudge d691: 00496 – Simply Subsets

【題目敘述】https://zerojudge.tw/ShowProblem?problemid=d691
【解題想法】

• (Line 22~30) 找出集合 A 和 B 的交集元素，置於另一集合 st。同時把這些交集元素從集合 A 和 B 中移除。
```#include <iostream>
#include <sstream>
#include <set>
using namespace std;

int main() {
string s;
stringstream ss;
while (getline(cin, s)){
set <string> A, B, st;
ss.clear();
ss.str(s);
while (ss >> s){
A.insert(s);
}
getline(cin, s);
ss.clear();
ss.str(s);
while (ss >> s){
B.insert(s);
}
for (auto i:A){
if (B.count(i)) {
st.insert(i);
B.erase(i);
}
}
for (auto i: st){
A.erase(i);
}
if (A.empty() && B.empty()){
cout << "A equals B\n";
} else if (A.empty()){
cout << "A is a proper subset of B\n";
} else if (B.empty()){
cout << "B is a proper subset of A\n";
} else {
if (st.empty()){
cout << "A and B are disjoint\n";
} else {
cout << "I'm confused!\n";
}
}
}
return 0;
}
```

Python code (credit: Amy Chou)

```while True:
try:
A = set(map(int, input().split()))
B = set(map(int, input().split()))

if A == B:
print("A equals B")
elif A.issubset(B):
print("A is a proper subset of B")
elif B.issubset(A):
print("B is a proper subset of A")
elif A.isdisjoint(B):
print("A and B are disjoint")
else:
print("I'm confused!")
except:
break
```