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  • Atcoder256 E2022-06-27 21:31:08

    #include <bits/stdc++.h> using i64 = long long; int main() { std::cin.tie(nullptr)->sync_with_stdio(false); int n; std::cin >> n; std::vector<int> a(n + 1), f(n + 1), c(n + 1); std::iota(f.begin(), f.end(), 0); for (int i =

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