Submission #127104

#	Time	Username	Problem	Language	Result	Execution time	Memory
127104		eriksuenderhauf	Matching (CEOI11_mat)	C++11	100 / 100	510 ms	48848 KiB

mat

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%I64d", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%I64d\n", (n))
#define pii pair<int, int>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vi vector<int>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> oset;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 1e6 + 5;
const double eps = 1e-9;
int nxl[MAXN], nxr[MAXN], b[MAXN];
int lp[MAXN], rp[MAXN], f[MAXN];
int s[MAXN], h[MAXN], a[MAXN];
int n, m;
vi ans;

int f1(int x)
{
    if (x < 0) return x;
    if (nxl[x] == x)
        return x;
    return nxl[x] = f1(nxl[x]);
}

int f2(int x)
{
    if (x >= n) return x;
    if (nxr[x] == x)
        return x;
    return nxr[x] = f2(nxr[x]);
}

bool g1(int x, int p)
{
    return a[x - lp[p]] <= a[x] && a[x] <= a[x - rp[p]];
}

bool g2(int x, int p)
{
    return h[x - lp[p]] <= h[x] && h[x] <= h[x - rp[p]];
}

int main()
{
    ni(n), ni(m);
    for (int i = 0; i < n; i++)
    {
        ni(s[i]);
        s[i]--;
        a[s[i]] = i;
        nxl[i] = nxr[i] = i;
    }
    for (int i = n - 1; i >= 0; i--)
    {
        nxl[a[i]] = f1(a[i] - 1);
        nxr[a[i]] = f2(a[i] + 1);
        if (nxr[a[i]] < n)
            rp[i] = i - s[nxr[a[i]]];
        if (nxl[a[i]] >= 0)
            lp[i] = i - s[nxl[a[i]]];
    }
    int p = 0;
    for (int i = 1; i < n; i++)
    {
        while (p > 0 && !g1(i, p))
            p = f[p];
        if (g1(i, p))
            p++;
        f[i + 1] = p;
    }
    p = 0;
    for (int i = 0; i < m; i++)
    {
        ni(h[i]);
        while (p > 0 && !g2(i, p))
            p = f[p];
        if (g2(i, p))
            p++;
        if (p == n)
            ans.pb(i - n + 2), p = f[p];
    }
    pri(ans.size());
    for (int i: ans)
        printf("%d ", i);
    enl;
    return 0;
}

Compilation message (stderr)

mat.cpp: In function 'int main()':
mat.cpp:11:34: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
 #define pri(n) printf("%d\n", (n))
                               ~~~^
mat.cpp:102:5: note: in expansion of macro 'pri'
     pri(ans.size());
     ^~~
mat.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     ni(n), ni(m);
          ^
mat.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
mat.cpp:7:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 #define ni(n) scanf("%d", &(n))
               ~~~~~^~~~~~~~~~~~
mat.cpp:68:9: note: in expansion of macro 'ni'
         ni(s[i]);
         ^~
mat.cpp:7:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 #define ni(n) scanf("%d", &(n))
               ~~~~~^~~~~~~~~~~~
mat.cpp:94:9: note: in expansion of macro 'ni'
         ni(h[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