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- for(auto it1 = st.rbegin(); it1 != st.rend(); it1--) {
- for(auto it2 = st.begin(); it2 != st.end(); it2++) {
- if(*it1 == *it2) {
- break;
- }
- if(st.count(abs(*it1 - *it2)) == 0) {
- ok = 1;
- st.insert(*it1 - *it2);
- // cerr << *it1 - *it2 << '\n';
- f = 1;
- ans ^= 1;
- break;
- }
- }
- if(f) break;
- }
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