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1702. [Usaco2007 Mar]Gold Balanced Lineup 平衡的队列
https://hydro.ac/d/bzoj/record/63a46372b053be17396a0c2c
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BZOJ/1702/1702.cpp
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BZOJ/1702/1702.cpp
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#include <iostream>
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#include <algorithm>
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#include <map>
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#include <vector>
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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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int n, m, ans;
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std::map<std::vector<int>, int> map;
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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 >> n >> m;
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std::vector<int> s(m);
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map[s] = 0;
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for (int i = 1, x; i <= n; i++) {
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cin >> x;
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for (int j = 0; j < m; j++) {
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if (x >> j & 1) s[j]++;
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}
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if (!std::count(s.begin(), s.end(), 0)) {
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for (int& x : s) x--;
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}
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if (map.count(s)) {
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ans = std::max(ans, i - map[s]);
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} else {
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map[s] = i;
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}
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}
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cout << ans << endl;
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return 0;
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}
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