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31 lines
851 B
C++
31 lines
851 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 5000050;
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char s[N];
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deque<int> pos[26];
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int main()
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{
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const auto sz = acos(-1);
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int k;
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scanf("%s%d", s, &k);
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int n = strlen(s);
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for (int i = 0; i < n; i++) pos[s[i] - 'a'].push_back(i);
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int lmost = 0, lsec = 0;
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while (pos[lmost].empty()) lmost++;
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lsec = lmost + 1;
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while (lsec < 26 && pos[lsec].empty()) lsec++;
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for (int i = 0; i < n; i++)
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{
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while (pos[lmost].size() && pos[lmost].front() < i) pos[lmost].pop_front();
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if (pos[lmost].empty())
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{
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while (pos[lmost].empty()) lmost++;
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lsec = lmost + 1;
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while (lsec < 26 && pos[lsec].empty()) lsec++;
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}
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}
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return 0;
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}
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