Submission #698292

#	Time	Username	Problem	Language	Result	Execution time	Memory
698292		DennisTran	Matching (CEOI11_mat)	C++17	100 / 100	1442 ms	61068 KiB

mat

#pragma GCC optimize("O2")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FOD(i, a, b) for (int i = (a); i >= (b); i--)
#define REP(i, n) for (int i = 0; i < (n); i++)
#define ALL(x) (x).begin(), (x).end()
#define TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }

using namespace std;

const int MAXN = 1e6 + 5;
const int MOD = 1e9 + 7;

inline void add(int &x, int val) {
    x += val;
    if (x >= MOD) x -= MOD;
    if (x < 0) x += MOD;
}

int N, M, ori, a[MAXN], h[MAXN], it[4 * MAXN], Pow[MAXN], Pow1[MAXN], lazy[4 * MAXN], sl[4 * MAXN];
vector <int> nen;

void down(int id) {
    FOR(i, id * 2, id * 2 + 1) {
        lazy[i] += lazy[id];
        add(it[i], 1ll * Pow1[sl[i]] * lazy[id] % MOD);
    } lazy[id] = 0;
}

void update(int id, int l, int r, int x, int val) {
    if (l == r) {
        if (val > 0) it[id] = val, sl[id]++;
        else it[id] = 0, sl[id]--;
        return;
    }
    down(id);
    int mid = l + r >> 1;
    if (mid >= x) update(id * 2, l, mid, x, val);
    else update(id * 2 + 1, mid + 1, r, x, val);
    it[id] = 1ll * Pow[sl[id * 2 + 1]] * it[id * 2] % MOD;
    add(it[id], it[id * 2 + 1]);
    sl[id] = sl[id * 2] + sl[id * 2 + 1];
}

signed main(void) {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    file("TASK");
    cin >> N >> M;
    Pow[0] = 1;
    Pow1[0] = 0;
    FOR(i, 1, N) {
        cin >> a[i];
        ori = (1ll * M * ori + a[i]) % MOD;
        Pow[i] = 1ll * Pow[i - 1] * M % MOD;
        Pow1[i] = (1ll * Pow1[i - 1] * M + 1) % MOD;
    }
    FOR(i, 1, M) cin >> h[i], nen.emplace_back(h[i]);
    sort(ALL(nen));
    FOR(i, 1, M) h[i] = lower_bound(ALL(nen), h[i]) - nen.begin() + 1;
    FOR(i, 1, N) update(1, 1, M, h[i], i);

    vector <int> ans;
    if (it[1] == ori) ans.emplace_back(1);
    FOR(i, N + 1, M) {
        update(1, 1, M, h[i - N], -1);
        add(it[1], -Pow1[sl[1]]);
        lazy[1]--;
        update(1, 1, M, h[i], N);
        if (it[1] == ori) ans.emplace_back(i - N + 1);
    }
    cout << ans.size() << '\n';
    for (int x : ans) cout << x << ' ';
    cerr << "Time elapsed: " << TIME << " s.\n";
    return (0 ^ 0);
}

Compilation message (stderr)

mat.cpp: In function 'void update(int, int, int, int, int)':
mat.cpp:39:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   39 |     int mid = l + r >> 1;
      |               ~~^~~
mat.cpp: In function 'int main()':
mat.cpp:9:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mat.cpp:49:5: note: in expansion of macro 'file'
   49 |     file("TASK");
      |     ^~~~
mat.cpp:9:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
mat.cpp:49:5: note: in expansion of macro 'file'
   49 |     file("TASK");
      |     ^~~~

• 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: 8 / 8
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10