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P4824 [USACO15FEB] Censoring S
https://www.luogu.com.cn/record/84303219
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Luogu/P4824/P4824.cpp
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51
Luogu/P4824/P4824.cpp
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#include <iostream>
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#include <algorithm>
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#include <cmath>
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#include <stack>
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#include <string>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e6 + 5;
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const int hash = 233333;
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int cnt;
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char st[N];
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std::string s, t;
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unsigned long long p = 1, h[N], t_hash;
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> s >> t;
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int n = s.size();
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int m = t.size();
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s = ' ' + s;
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for (char c : t) {
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t_hash = t_hash * hash + c;
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p *= hash;
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}
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for (int i = 1; i <= n; i++) {
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st[++cnt] = s[i];
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h[cnt] = h[cnt - 1] * hash + s[i];
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if (cnt >= m && h[cnt] - h[cnt - m] * p == t_hash) {
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cnt -= m;
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}
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}
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for (int i = 1; i <= cnt; i++) {
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cout << st[i];
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}
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cout << endl;
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return 0;
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}
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