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49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
#include <cstdio>
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#include <cctype>
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#include <algorithm>
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#include <list>
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using namespace std;
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void getint(int &x)
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{
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int ch = x = 0;
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while (!isdigit(ch = getchar()))
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;
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for (; isdigit(ch); ch = getchar())
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x = x * 10 + ch - '0';
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}
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const int N = 3e5 + 10;
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list<int> S[N];
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int main()
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{
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int T, n, q, op, s, v, t;
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getint(T);
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while (T--)
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{
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getint(n), getint(q);
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for (int i = 1; i <= n; i++)
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S[i].clear();
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while (q--)
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{
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getint(op);
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if (op == 1)
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{
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getint(s), getint(v);
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S[s].push_back(v);
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}
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if (op == 2)
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{
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getint(s);
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if (S[s].empty())
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puts("EMPTY");
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else
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printf("%d\n", S[s].back()), S[s].pop_back();
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}
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if (op == 3)
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{
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getint(s), getint(t);
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S[s].splice(S[s].end(), S[t]);
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}
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}
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}
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return 0;
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} |