Submission #741918

#	Time	Username	Problem	Language	Result	Execution time	Memory
741918		marvinthang	Matching (CEOI11_mat)	C++17	100 / 100	292 ms	51940 KiB

mat

/*************************************
*    author: marvinthang             *
*    created: 15.02.2023 15:22:23    *
*************************************/

#include <bits/stdc++.h>

using namespace std;

#define                  fi  first
#define                  se  second
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define              ALL(v)  (v).begin(), (v).end()
#define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
#define        FOR(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i) 
#define       FORD(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i) 
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
    #include "debug.h"
#else
    #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
    #define DB(...) 23
    #define db(...) 23
    #define debug(...) 23
#endif

template <class T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> scan_op(pair <U, V>)  { return in >> u.fi >> u.se; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")";  else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }

// end of template

const int MAX = 1e6 + 5;

int N, M, S[MAX], H[MAX + MAX];

void init(void) {
    cin >> N >> M;
    REP(i, N) cin >> S[i];
    REP(i, M) cin >> H[i + N];
}

int pre[MAX], nxt[MAX], left[MAX], right[MAX], kmp[MAX + MAX];

bool check(int j, int i) {
    if (j == N) return false;
    if (~left[j] && H[i] <= H[i - j + left[j]]) return false;
    if (~right[j] && H[i] >= H[i - j + right[j]]) return false;
    return true;
}

void process(void) {
    REP(i, N) {
        H[--S[i]] = i;
        pre[i] = i - 1;
        nxt[i] = i + 1;
    }
    FORD(i, N - 1, 0) {
        int p = pre[H[i]], n = nxt[H[i]];
        left[i] = p >= 0 ? S[p] : -1;
        right[i] = n < N ? S[n] : -1;
        if (p >= 0) nxt[p] = n;
        if (n < N) pre[n] = p;
    }
    vector <int> res;
    FOR(i, 1, M + N - 1) {
        int j = kmp[i - 1];
        while (j && !check(j, i)) j = kmp[j - 1];
        if (check(j, i)) ++j;
        kmp[i] = j;
        if (j == N) res.push_back(i - N - N + 2);
    }
    cout << res.size() << '\n';
    for (int x: res) cout << x << ' ';
}

int main(void) {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
    file("test");
    init();
    process();
    cerr << "Time elapsed: " << TIME << " s.\n";
    return (0^0);
}

Compilation message (stderr)

mat.cpp: In function 'int main()':
mat.cpp:27:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mat.cpp:88:5: note: in expansion of macro 'file'
   88 |     file("test");
      |     ^~~~
mat.cpp:27:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
mat.cpp:88:5: note: in expansion of macro 'file'
   88 |     file("test");
      |     ^~~~

• 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