結果
問題 | No.3063 Circle Balancing |
ユーザー |
👑 ![]() |
提出日時 | 2025-03-14 22:58:43 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 319 ms / 3,000 ms |
コード長 | 3,615 bytes |
コンパイル時間 | 1,022 ms |
コンパイル使用メモリ | 83,384 KB |
実行使用メモリ | 69,384 KB |
最終ジャッジ日時 | 2025-03-14 22:58:52 |
合計ジャッジ時間 | 8,656 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 27 |
ソースコード
#ifdef NACHIA#define _GLIBCXX_DEBUG#else#define NDEBUG#endif#include <iostream>#include <string>#include <vector>#include <algorithm>using i64 = long long;using u64 = unsigned long long;#define rep(i,n) for(i64 i=0; i<i64(n); i++)const i64 INF = 1001001001001001001;template<typename A> void chmin(A& l, const A& r){ if(r < l) l = r; }template<typename A> void chmax(A& l, const A& r){ if(l < r) l = r; }using namespace std;namespace nachia{template<class S,S op(S l, S r)>struct Segtree {private:int N;std::vector<S> A;int xN;void mergev(int i){if(i < N) A[i] = op(A[i*2], A[i*2+1]);}template<class E>int minLeft2(int r, E cmp, int a = 0, int b = 0, int i = -1) const {static S x;if(i == -1){ a=0; b=N; i=1; x=A[0]; }if(r <= a) return a;if(b <= r){S nx = op(A[i], x);if(cmp(nx)){ x = nx; return a; }}if(b - a == 1) return b;int q = minLeft2(r, cmp, (a+b)/2, b, i*2+1);if(q > (a+b)/2) return q;return minLeft2(r, cmp, a, (a+b)/2, i*2);}template<class E>int maxRight2(int l, E cmp, int a = 0, int b = 0, int i = -1) const {static S x;if(i == -1){ a=0; b=N; i=1; x=A[0]; }if(b <= l) return b;if(l <= a){S nx = op(x, A[i]);if(cmp(nx)){ x = nx; return b; }}if(b - a == 1) return a;int q = maxRight2(l, cmp, a, (a+b)/2, i*2);if(q < (a+b)/2) return q;return maxRight2(l, cmp, (a+b)/2, b, i*2+1);}public:Segtree() : N(0) {}Segtree(int n, S e) : xN(n) {N = 1; while (N < n) N *= 2;A.assign(N * 2, e);}Segtree(const std::vector<S>& a, S e) : Segtree(a.size(), e){for(int i=0; i<(int)a.size(); i++) A[i + N] = a[i];for(int i=N-1; i>=1; i--) mergev(i);}S getE() const { return A[0]; }void set(int p, S x){p += N; A[p] = x;for(int d=1; (1<<d)<=N; d++) mergev(p>>d);}S get(int p) const { return A[N+p]; }S prod(int l, int r) const {l += N; r += N;S ql = A[0], qr = A[0];while(l<r){if(l&1) ql = op(ql, A[l++]);if(r&1) qr = op(A[--r], qr);l /= 2;r /= 2;}return op(ql, qr);}S allProd() const { return A[1]; }// bool cmp(S)template<class E>int minLeft(int r, E cmp) const {return minLeft2(r, cmp);}// bool cmp(S)template<class E>int maxRight(int l, E cmp) const {int x = maxRight2(l, cmp);return x > xN ? xN : x;}};} // namespace nachiastruct Node {i64 c0;i64 c1;i64 c10;};Node op(Node l, Node r){return {l.c0 + r.c0,l.c1 + r.c1,min(l.c1 + r.c10, l.c10 + r.c0)};}void testcase(){i64 N; cin >> N;vector<i64> A(N); rep(i,N){ cin >> A[i]; A[i]--; }auto seg = nachia::Segtree<Node, op>(vector<Node>(N*2,{1,0,0}), {0,0,0});i64 ans = N;vector<vector<i64>> I(N);rep(i,N) I[A[i]].push_back(i);rep(a,N) if(I[a].size()){i64 t = N - I[a].size();rep(j,I[a].size()-1) t += seg.prod(I[a][j]+1, I[a][j+1]).c10;t += seg.prod(I[a].back()+1, I[a][0]+N).c10;for(auto i : I[a]){seg.set(i, { 0,1,0 });seg.set(N+i, { 0,1,0 });}chmin(ans, t);}cout << ans << "\n";}int main(){ios::sync_with_stdio(false); cin.tie(nullptr);testcase();return 0;}