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#include <bits/stdc++.h>
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using namespace std;
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string expand() {
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int d;
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char x;
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string s;
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while (cin >> x) {
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if (x == '[') {
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cin >> d;
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string t = expand();
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while (d--) s += t;
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} else if (x == ']')
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return s;
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else s += x;
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}
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return s;
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}
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int main() {
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cout << expand();
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return 0;
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} |
