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- string s;
- int pref[SZ];
- void build_pref() {
- pref[0] = 0;
- for (int i = 1; i < n; i++) {
- int j = i - 1;
- while (j >= 0 && s[pref[j]] != s[i])
- j = pref[j] - 1;
- if (j < 0)
- pref[i] = pref[j] + 1;
- else
- pref[i] = 0;
- }
- }
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