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P1827 [USACO3.4]美国血统 American Heritage
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problem/P1827/P1827.cpp
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28
problem/P1827/P1827.cpp
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#include <bits/stdc++.h>
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using namespace std;
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string pre, in, post;
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void dfs(string pre, string in) {
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if (pre.empty()) {
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return;
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}
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char root = pre[0];
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int k = in.find(root);
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pre.erase(pre.begin());
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string leftpre = pre.substr(0, k);
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string rightpre = pre.substr(k);
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string leftin = in.substr(0, k);
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string rightin = in.substr(k + 1);
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dfs(leftpre, leftin);
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dfs(rightpre, rightin);
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post.push_back(root);
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}
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int main() {
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cin >> in >> pre;
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dfs(pre, in);
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cout << post << endl;
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return 0;
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}
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