제출 #898957

#제출 시각아이디문제언어결과실행 시간메모리
898957efedmrlr서열 (APIO23_sequence)C++17
0 / 100
392 ms60496 KiB
// #pragma GCC optimize("O3,Ofast,unroll-loops") // #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt") #include <bits/stdc++.h> #include "sequence.h" using namespace std; #define lli long long int #define MP make_pair #define pb push_back #define REP(i,n) for(int i = 0; (i) < (n); (i)++) void fastio() { ios_base::sync_with_stdio(false); cin.tie(NULL); } const double EPS = 0.00001; const int INF = 1e9+500; const int ALPH = 26; const int LGN = 25; constexpr int MOD = 1e9+7; int N,m,q; struct Node { int mn, mx, tag; Node() : mn(INF), mx(-INF), tag(0) {}; Node(int v) : mn(v), mx(v), tag(0) {}; Node merge(Node &oth) { Node ret; ret.mx = max(oth.mx, mx); ret.mn = min(oth.mn, mn); return ret; } void add(int x) { mn += x; mx += x; tag += x; } }; struct SegTree { vector<Node> data; int sz; SegTree() : sz(0) {} void reset(int s) { sz = s; data.assign(4*(sz + 3), Node()); } void push(int v) { data[v<<1].add(data[v].tag); data[v<<1^1].add(data[v].tag); data[v].tag = 0; } void build(int tl, int tr, int v, vector<int> &vec) { if(tl == tr) { data[v] = Node(vec[tl]); return; } int tm = (tl + tr) >> 1; build(tl, tm, v<<1, vec); build(tm + 1, tr, v<<1^1, vec); data[v] = data[v<<1].merge(data[v<<1^1]); } int getMin(int tl, int tr, int v, int l, int r) { if(tl >= l && tr <= r) { return data[v].mn; } if(tl > r || tr < l) return INF; int tm = (tl + tr) >> 1; push(v); return min(getMin(tl, tm, v<<1, l, r), getMin(tm + 1, tr, v<<1^1, l, r)); } int getMin(int l, int r) { l = max(0, l); r = min(sz, r); if(l > r) return 0; return getMin(0, sz, 1, l, r); } int getMax(int tl, int tr, int v, int l, int r) { if(tl >= l && tr <= r) { return data[v].mx; } if(tl > r || tr < l) return -INF; int tm = (tl + tr) >> 1; push(v); return min(getMax(tl, tm, v<<1, l, r), getMax(tm + 1, tr, v<<1^1, l, r)); } int getMax(int l, int r) { l = max(0, l); r = min(sz, r); if(l > r) return 0; return getMax(0, sz, 1, l, r); } void update(int tl, int tr, int v, int l, int r, int val) { if(tl >= l && tr <= r) { data[v].add(val); return; } if(tl > r || tr < l) { return; } int tm = (tl + tr) >> 1; push(v); update(tl, tm, v<<1, l, r, val); update(tm + 1, tr, v<<1^1, l, r, val); data[v] = data[v<<1].merge(data[v<<1^1]); } void update(int l, int r, int val) { l = max(0, l); r = min(sz, r); if(l > r) return; update(0, sz, 1, l, r, val); } }; SegTree st; vector<vector<int> > occ; vector<int> pr; int getSum(int l, int r) { l = max(0, l); r = min(N - 1, r); if(l > r) return 0; return st.getMax(r, r) - (l == 0 ? 0 : st.getMax(l - 1, l - 1)); } int sequence(int n, vector<int> a) { N = n; st.reset(n - 1); occ.assign(n + 1, vector<int>()); pr.assign(n, 0); for(int i = 0; i<n; i++) { occ[a[i]].pb(i); } pr[0] = 1; for(int i = 1; i<n; i++) pr[i] = pr[i - 1] + 1; st.build(0, n - 1, 1, pr); for(int i = 1; i<=n; i++) { for(auto c : occ[i]) { st.update(c, n - 1, -1); } if(occ[i].size() > 1) { int fir = occ[i][0], sec = occ[i][1]; int mx = st.getMax(sec + 1, n - 1) - st.getMin(0, fir - 1); int mn = st.getMin(sec + 1, n - 1) - st.getMax(0, fir - 1); if(mx >= -2 && mn <= 2) { return 2; } } for(auto c : occ[i]) { st.update(c, n - 1, -1); } } return 1; }
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