Submission #143169

#	Time	Username	Problem	Language	Result	Execution time	Memory
143169		popovicirobert	Matching (CEOI11_mat)	C++14	100 / 100	963 ms	65536 KiB

mat

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long



/*const int MOD = ;

inline int lgput(int a, int b) {
    int ans = 1;
    while(b > 0) {
        if(b & 1) ans = (1LL * ans * a) % MOD;
        b >>= 1;
        a = (1LL * a * a) % MOD;
    }
    return ans;
}

inline void mod(int &x) {
    if(x >= MOD)
        x -= MOD;
}

inline void add(int &x, int y) {
    x += y;
    mod(x);
}

inline void sub(int &x, int y) {
    x += MOD - y;
    mod(x);
}

inline void mul(int &x, int y) {
    x = (1LL * x * y) % MOD;
}

inline int inv(int x) {
    return lgput(x, MOD - 2);
}*/

/*int fact[], invfact[];

inline void prec(int n) {
    fact[0] = 1;
    for(int i = 1; i <= n; i++) {
        fact[i] = (1LL * fact[i - 1] * i) % MOD;
    }
    invfact[n] = lgput(fact[n], MOD - 2);
    for(int i = n - 1; i >= 0; i--) {
        invfact[i] = (1LL * invfact[i + 1] * (i + 1)) % MOD;
    }
}

inline int comb(int n, int k) {
    if(n < k) return 0;
    return (1LL * fact[n] * (1LL * invfact[k] * invfact[n - k] % MOD)) % MOD;
}*/

using namespace std;

const int MAXN = (int) 1e6;
const int B = 1e9 + 7;

ull pw[MAXN + 1];
pair <int, int> h[MAXN + 1];
int nrm[MAXN + 1], n;

struct Node {
    ull hsh;
    int cnt;
}aint[1 << 21];

inline Node refresh(Node &a, Node &b) {
    return {a.hsh * pw[b.cnt] + b.hsh, a.cnt + b.cnt};
}

void add(int nod, int left, int right, int pos, int val) {
    if(left == right) {
        aint[nod] = {val, 1};
        return ;
    }
    int mid = (left + right) / 2;
    if(pos <= mid) add(2 * nod, left, mid, pos, val);
    else add(2 * nod + 1, mid + 1, right, pos, val);
    aint[nod] = refresh(aint[2 * nod], aint[2 * nod + 1]);
}

void del(int nod, int left, int right, int pos) {
    if(left == right) {
        aint[nod] = {0, 0};
        return ;
    }
    int mid = (left + right) / 2;
    if(pos <= mid) del(2 * nod, left, mid, pos);
    else del(2 * nod + 1, mid + 1, right, pos);
    aint[nod] = refresh(aint[2 * nod], aint[2 * nod + 1]);
}

int main() {
#if 0
    ifstream cin("A.in");
    ofstream cout("A.out");
#endif
    int i, m;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    cin >> m >> n;
    pw[0] = 1;
    for(i = 1; i <= n; i++) {
        pw[i] = pw[i - 1] * B;
    }
    ull hsh = 0;
    for(i = 1; i <= m; i++) {
        int x;
        cin >> x;
        hsh += x * pw[m - i];
    }

    for(i = 1; i <= n; i++) {
        cin >> h[i].first;
        h[i].second = i;
    }
    sort(h + 1, h + n + 1);
    for(i = 1; i <= n; i++) {
        nrm[h[i].second] = i;
    }

    for(i = 1; i < m; i++) {
        add(1, 1, n, nrm[i], i);
    }
    ull sum = 0;
    for(i = 0; i < m; i++) {
        sum += pw[i];
    }
    vector <int> sol;
    for(i = 1; i <= n - m + 1; i++) {
        add(1, 1, n, nrm[i + m - 1], i + m - 1);
        if(aint[1].hsh - sum * (i - 1) == hsh) {
            sol.push_back(i);
        }
        del(1, 1, n, nrm[i]);
    }
    cout << sol.size() << "\n";
    for(auto it : sol) {
        cout << it << " ";
    }

    return 0;
}

Compilation message (stderr)

mat.cpp: In function 'void add(int, int, int, int, int)':
mat.cpp:81:28: warning: narrowing conversion of 'val' from 'int' to 'long long unsigned int' inside { } [-Wnarrowing]
         aint[nod] = {val, 1};
                            ^

• 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