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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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string s1, s2;
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getline(cin, s1);
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getline(cin, s2);
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//查找子串位置
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if (s2.find(s1) != s2.npos) {
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cout << s1 << " is substring of " << s2 << endl;
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} else {
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cout << "No substring" << endl;
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}
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return 0;
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}
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