Submission #205958

#	Time	Username	Problem	Language	Result	Execution time	Memory
205958		parsa_mobed	Matching (CEOI11_mat)	C++14	100 / 100	1936 ms	53340 KiB

mat

#include <bits/stdc++.h>

using namespace std;
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;

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

inline void add(int idx) {
    for (idx++; idx < N; idx += idx&(-idx)) fen[idx]++;
}
inline void rem(int idx) {
    for (idx++; idx < N; idx += idx&(-idx)) fen[idx]--;
}
inline int get(int idx) {
    int res = 0;
    for (idx++; idx; idx -= idx&(-idx)) res += fen[idx];
    return res;
}

int main()
{
    pw[0] = 1;
    for (int i = 1; i < N; i++) pw[i] = pw[i - 1] * Base;
    // --------------------------------------------------------------
    scanf("%d%d", &n, &m);
    for (int i = 0; i < n; i++) {int x; scanf("%d", &x); a[x - 1] = i;}
    for (int i = 0; i < m; i++) scanf("%d", 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(b[i - n] - 1) * pw[n - 1] + Get(b[i - n] + 1, m);
            rem(b[i - n]), Set(b[i - n], 0);
        }
        apply(1, 1);
        CurHash = CurHash * Base + get(b[i]) + Get(b[i], m);
        add(b[i]), Set(b[i], 1);
        if (i >= n - 1) if (CurHash == Hash) ans.push_back(i - n + 2);
    }
    printf("%d\n", (int)ans.size());
    for (int i = 0; i < ans.size(); i++) printf("%d ", ans[i]);
    printf("\n");

    return 0;
}

Compilation message (stderr)

mat.cpp: In function 'int main()':
mat.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < ans.size(); i++) printf("%d ", ans[i]);
                     ~~^~~~~~~~~~~~
mat.cpp:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
mat.cpp:51:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 0; i < n; i++) {int x; scanf("%d", &x); a[x - 1] = i;}
                                         ~~~~~^~~~~~~~~~
mat.cpp:52:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 0; i < m; i++) scanf("%d", b + i), vec.push_back(b[i]);
                                 ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• 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