Submission #205950

#	Time	Username	Problem	Language	Result	Execution time	Memory
205950		parsa_mobed	Matching (CEOI11_mat)	C++14	92 / 100	2082 ms	47336 KiB

mat

#include <bits/stdc++.h>

using namespace std;
#define mid ((L+R)>>1)
const int N = 1e6 + 5;
int Base = 1e6 + 3;
int a[N], b[N], p[N], pw[N], seg[N<<2], lazy[N<<2], fen[N], Hash, n, m;
vector <int> ans, vec;

void apply(int id, int val) {
    seg[id] = seg[id] * pw[val], lazy[id] += val;
}
void shift(int id) {
    if (lazy[id] == 0) return ;
    apply(id<<1, lazy[id]), apply(id<<1|1, lazy[id]);
    lazy[id] = 0;
}
void Set(int l, int val, int L = 0, int R = m, int id = 1) {
    if (l + 1 <= L || R <= l) return ;
    if (l <= L && R <= l + 1) {
        seg[id] = val;
        return ;
    }
    shift(id);
    Set(l, val, L, mid, id<<1);
    Set(l, val, mid, R, id<<1|1);
    seg[id] = seg[id<<1] + seg[id<<1|1];
}
int Get(int l, int r, int L = 0, int R = m, int id = 1) {
    if (r <= L || R <= l) return 0;
    if (l <= L && R <= r) return seg[id];
    shift(id);
    return Get(l, r, L, mid, id<<1) + Get(l, r, mid, R, id<<1|1);
}

void add_fen(int idx, int val) {
    for (idx++; idx < N; idx += idx&(-idx)) fen[idx] += val;
}
int get_fen(int idx) {
    int res = 0;
    for (idx++; idx; idx -= idx&(-idx)) res += fen[idx];
    return res;
}

int main()
{
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    pw[0] = 1;
    for (int i = 1; i < N; i++) pw[i] = pw[i - 1] * Base;
    // --------------------------------------------------------------
    cin >> n >> m;
    for (int i = 0; i < n; i++) {int x; cin >> x; a[x - 1] = i;}
    for (int i = 0; i < m; i++) cin >> b[i], vec.push_back(b[i]);
    sort(vec.begin(), vec.end());
    for (int i = 0; i < m; i++) b[i] = lower_bound(vec.begin(), vec.end(), b[i]) - vec.begin(), p[b[i]] = i;
    for (int i = 0; i < n; i++) Hash = Hash * Base + a[i];
    // --------------------------------------------------------------
    int CurHash = 0;
    for (int i = 0; i < m; i++) {
        if (i >= n) {
            CurHash -= get_fen(b[i - n] - 1) * pw[n - 1] + Get(b[i - n] + 1, m);
            add_fen(b[i - n], -1), Set(b[i - n], 0);
        }
        apply(1, 1);
        CurHash = CurHash * Base + get_fen(b[i]) + Get(b[i], m);
        add_fen(b[i], 1), Set(b[i], 1);
        if (i >= n - 1) if (CurHash == Hash) ans.push_back(i - n + 2);
    }
    cout << ans.size() << "\n";
    for (int i : ans) cout << i << " ";
    cout << "\n";

    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 9 / 9
• Subtask 7: 9 / 9
• Subtask 8: 9 / 9
• Subtask 9: 0 / 8
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10