Submission #151874

#TimeUsernameProblemLanguageResultExecution timeMemory
151874forestryksMatching (CEOI11_mat)C++14
72 / 100
2070 ms48140 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; using pii = pair<int, int>; #define rep(i, n) for (int (i) = 0; (i) < (n); ++(i)) #define all(x) (x).begin(), (x).end() #define FAST_IO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); #define f first #define s second const int MAXN = 1e6 + 5; int m, n; int p[MAXN]; int a[MAXN * 2]; int up[MAXN]; int down[MAXN]; int pf[MAXN * 2]; int t[MAXN * 4]; void update(int v, int tl, int tr, int p, int x) { // if (tr - tl == 1) { // t[v] += x; // return; // } // int tm = tl + (tr - tl) / 2; // if (p < tm) { // update(v * 2 + 1, tl, tm, p, x); // } else { // update(v * 2 + 2, tm, tr, p, x); // } // t[v] = t[v * 2 + 1] + t[v * 2 + 2]; t[p] += x; } int find_last(int v, int tl, int tr, int l, int r) { // if (r <= tl || tr <= l) return -1; // int tm = tl + (tr - tl) / 2; // if (l <= tl && tr <= r) { // if (t[v] == 0) return -1; // if (tr - tl == 1) return tl; // if (t[v * 2 + 2] != 0) return find_last(v + 2 + 2, tm, tr, l, r); // return find_last(v * 2 + 1, tl, tm, l, r); // } // int res = find_last(v * 2 + 2, tm, tr, l, r); // if (res == -1) res = find_last(v * 2 + 1, tl, tm, l, r); // return res; for (int i = r - 1; i >= l; --i) { if (t[i]) return i; } return -1; } int find_first(int v, int tl, int tr, int l, int r) { // if (r <= tl || tr <= l) return -1; // int tm = tl + (tr - tl) / 2; // if (l <= tl && tr <= r) { // if (t[v] == 0) return -1; // if (tr - tl == 1) return tl; // if (t[v * 2 + 1] != 0) return find_last(v + 2 + 1, tl, tm, l, r); // return find_last(v * 2 + 2, tm, tr, l, r); // } // int res = find_last(v * 2 + 1, tl, tm, l, r); // if (res == -1) res = find_last(v * 2 + 2, tm, tr, l, r); // return res; for (int i = l; i < r; ++i) { if (t[i]) return i; } return -1; } void calc() { fill(up, up + m, -1); fill(down, down + m, -1); rep(i, m) { update(0, 0, m, a[i], 1); } for (int i = m - 1; i >= 0; --i) { update(0, 0, m, a[i], -1); up[i] = find_first(0, 0, m, a[i], m); down[i] = find_last(0, 0, m, 0, a[i]); } rep(i, m) { if (up[i] != -1) up[i] = p[up[i]]; if (down[i] != -1) down[i] = p[down[i]]; } // for (int i = 0; i < m; ++i) { // auto it = s.lower_bound({a[i], 0}); // if (it != s.end()) { // up[i] = it->s; // } // if (it != s.begin()) { // down[i] = prev(it)->s; // } // s.insert({a[i], i}); // } } int main() { FAST_IO; cin >> m >> n; rep(i, m) { cin >> p[i]; p[i]--; } rep(i, m) { a[p[i]] = i; } a[m] = -1; rep(i, n) { cin >> a[m + 1 + i]; } calc(); pf[0] = 0; for (int i = 1; i < n + m + 1; ++i) { if (i == m) { pf[i] = 0; continue; } int j = pf[i - 1]; while (j > 0) { if (j == m) { j = pf[j - 1]; continue; } int u = up[j]; int d = down[j]; if ((d != -1 && a[i - j + d] > a[i]) || (u != -1 && a[i - j + u] < a[i])) { j = pf[j - 1]; continue; } pf[i] = j + 1; break; } if (j == 0) pf[i] = 1; } // rep(i, n + m + 1) { // cout << a[i] << ' '; // } // cout << endl; // rep(i, m) { // cout << down[i] << ' '; // } // cout << endl; // rep(i, m) { // cout << up[i] << ' '; // } // cout << endl; // rep(i, n + m + 1) { // cout << pf[i] << ' '; // } // cout << endl; vector<int> ans; for (int i = m + 1 + m - 1; i < n + m + 1; ++i) { if (pf[i] == m) { ans.push_back(i - m + 1 - m - 1); } } cout << ans.size() << endl; for (auto it : ans) { cout << it + 1 << ' '; } cout << endl; }
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