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NC232778 [模板]KMP字符串匹配
https://ac.nowcoder.com/acm/contest/view-submission?submissionId=50597340
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NowCoder/232778/232778.cpp
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37
NowCoder/232778/232778.cpp
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#pragma GCC optimize("Ofast")
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#include <iostream>
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#include <string>
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using std::cin;
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using std::cout;
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#define endl '\n'
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const int N = 1000005;
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int f[N], next[N];
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std::string s1, s2;
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> s1 >> s2;
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next[0] = -1;
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for (int i = 1, j = -1; i < s2.size(); i++) {
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while (j != -1 && s2[i] != s2[j + 1]) j = next[j];
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if (s2[i] == s2[j + 1]) j++;
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next[i] = j;
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}
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for (int i = 0, j = -1; i < s1.size(); i++) {
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while (j != -1 && (j == s2.size() || s1[i] != s2[j + 1])) j = next[j];
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if (s1[i] == s2[j + 1]) j++;
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if (j == s2.size() - 1) {
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cout << i - j + 1 << endl;
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f[i] = j;
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}
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}
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for (int i = 0; i < s2.size(); i++) {
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cout << next[i] + 1 << ' ';
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}
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cout << endl;
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return 0;
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}
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