diff --git a/Luogu/P4105/P4105.cpp b/Luogu/P4105/P4105.cpp new file mode 100644 index 00000000..314909bb --- /dev/null +++ b/Luogu/P4105/P4105.cpp @@ -0,0 +1,58 @@ +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 5e6 + 5; + +int n, s_a, s_b, s_c, s_d, a[N], b[N], mod, ans; + +inline int f(int x) { + return (static_cast(s_a) % mod * x % mod * x % mod * x % mod + + static_cast(s_b) % mod * x % mod * x % mod + + static_cast(s_c) % mod * x % mod + + s_d) + % mod; +} + +bool check(int x) { + std::copy_n(a + 1, n, b + 1); + + for (int i = 1; i <= n; i++) { + b[i] = std::max(b[i - 1], b[i] - x); + + if (std::abs(a[i] - b[i]) > x) return false; + } + + return true; +} + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + cin >> n >> s_a >> s_b >> s_c >> s_d >> a[1] >> mod; + + for (int i = 2; i <= n; i++) { + a[i] = (f(a[i - 1]) + f(a[i - 2])) % mod; + } + + int l = 0, r = mod; + + while (l <= r) { + int mid = l + r >> 1; + + if (check(mid)) { + ans = mid; + r = mid - 1; + } else { + l = mid + 1; + } + } + + cout << ans << endl; + + return 0; +} diff --git a/Luogu/P4105/data/P4105_1.in b/Luogu/P4105/data/P4105_1.in new file mode 100644 index 00000000..3ed322d1 --- /dev/null +++ b/Luogu/P4105/data/P4105_1.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:785c778307f79a68b9d27a81d049be9ddef9dd42e12a695af23d4d1488f62643 +size 31 diff --git a/Luogu/P4105/data/P4105_1.out b/Luogu/P4105/data/P4105_1.out new file mode 100644 index 00000000..aa248abe --- /dev/null +++ b/Luogu/P4105/data/P4105_1.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:c103df72e15cf510fd1acdd2fa2e71fdb7fb3ebf72441fd79d8aa1bee87169fd +size 4 diff --git a/Luogu/P4105/data/P4105_10.in b/Luogu/P4105/data/P4105_10.in new file mode 100644 index 00000000..aeddfc52 --- /dev/null +++ b/Luogu/P4105/data/P4105_10.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid 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