Submission #937475

#	Time	Username	Problem	Language	Result	Execution time	Memory
937475		gaga999	Palindromi (COCI22_palindromi)	C++17	110 / 110	218 ms	175572 KiB

Main

#include <cstdio>
#include <stdio.h>
#include <iostream>
#include <math.h>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <algorithm>
#include <utility>
#include <set>
#include <map>
#include <stdlib.h>
#include <cstring>
#include <string.h>
#include <string>
#include <sstream>
#include <assert.h>
#include <climits>
#include <sstream>
#include <numeric>
#include <time.h>
#include <limits.h>
#include <list>
#include <bitset>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <iomanip>
#include <complex>
#include <chrono>
#include <fstream>
#include <functional>
#include <unistd.h>
// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx,avx2,bmi,bmi2,lzcnt,popcnt")
#define lowbit(x) ((x) & -(x))
#define ml(a, b) ((1ll * (a) * (b)) % M)
#define tml(a, b) (a) = ((1ll * (a) * (b)) % M)
#define ad(a, b) ((0ll + (a) + (b)) % M)
#define tad(a, b) (a) = ((0ll + (a) + (b)) % M)
#define mi(a, b) ((0ll + M + (a) - (b)) % M)
#define tmi(a, b) (a) = ((0ll + M + (a) - (b)) % M)
#define tmin(a, b) (a) = min((a), (b))
#define tmax(a, b) (a) = max((a), (b))
#define iter(a) (a).begin(), (a).end()
#define riter(a) (a).rbegin(), (a).rend()
#define init(a, b) memset((a), (b), sizeof(a))
#define cpy(a, b) memcpy((a), (b), sizeof(a))
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define pb emplace_back
#define mpr make_pair
#define ls(i) ((i) << 1)
#define rs(i) ((i) << 1 | 1)
#define INF 0x3f3f3f3f
#define NIF 0xc0c0c0c0
#define eps 1e-9
#define F first
#define S second
#define AC cin.tie(0)->sync_with_stdio(0)
using namespace std;
typedef long long llt;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<llt, llt> pll;
typedef complex<double> cd;
// const int M = 998244353;

// random_device rm;
// mt19937 rg(rm());
// default_random_engine rg(rm());
// uniform_int_distribution<int> rd(INT_MIN, INT_MAX);
// uniform_real_distribution<double> rd(0, M_PI);

void db() { cerr << "\n"; }
template <class T, class... U>
void db(T a, U... b) { cerr << a << " ", db(b...); }

inline char gc()
{
    const static int SZ = 1 << 16;
    static char buf[SZ], *p1, *p2;
    if (p1 == p2 && (p2 = buf + fread(p1 = buf, 1, SZ, stdin), p1 == p2))
        return -1;
    return *p1++;
}
void rd() {}
template <typename T, typename... U>
void rd(T &x, U &...y)
{
    x = 0;
    bool f = 0;
    char c = gc();
    while (!isdigit(c))
        f ^= !(c ^ 45), c = gc();
    while (isdigit(c))
        x = (x << 1) + (x << 3) + (c ^ 48), c = gc();
    f && (x = -x), rd(y...);
}

template <typename T>
void prt(T x)
{
    if (x < 0)
        putchar('-'), x = -x;
    if (x > 9)
        prt(x / 10);
    putchar((x % 10) ^ 48);
}

const int N = 1e5 + 5;

struct TR
{
    vector<int> len, kp, bk[2], to[2];
    deque<int> dq;
    int cnt, ln, rn, sz;
    inline TR() : cnt(2), sz(0)
    {
        len = {-1, 0}, ln = rn = 1; // 0
        kp = bk[0] = bk[1] = to[0] = to[1] = {0, 0};
    }
    inline void add(int u, int vl)
    {
        len.pb(len[u] + 2);
        to[0].pb(0), to[1].pb(0);
        kp.pb(u ? to[vl][bk[vl][u]] : 1);
        to[vl][u] = cnt++;
    }
    void addr(int vl)
    {
        dq.pb(vl);
        int u;
        if (len[rn] < sz && dq[sz - len[rn] - 1] == vl)
            u = rn;
        else
            u = bk[vl][rn];
        if (!to[vl][u])
        {
            add(u, vl);
            int tp = dq[sz - len[kp.back()]];
            bk[tp].pb(kp.back());
            bk[tp ^ 1].pb(bk[tp ^ 1][kp.back()]);
        }
        rn = to[vl][u];
        if (len[rn] == ++sz)
            ln = rn;
    }
    void addl(int vl)
    {
        int u;
        if (len[ln] < sz && dq[len[ln]] == vl)
            u = ln;
        else
            u = bk[vl][ln];
        dq.push_front(vl);
        if (!to[vl][u])
        {
            add(u, vl);
            int tp = dq[len[kp.back()]];
            bk[tp].pb(kp.back());
            bk[tp ^ 1].pb(bk[tp ^ 1][kp.back()]);
        }
        ln = to[vl][u];
        if (len[ln] == ++sz)
            rn = ln;
    }
} tr[N];

char s[N];
int ds[N];

int f(int x)
{
    return ds[x] == x ? x : ds[x] = f(ds[x]);
}

signed main()
{
    int n, x, y;
    scanf("%d%s", &n, s + 1);
    iota(ds + 1, ds + n + 1, 1);
    for (int i = 1; i <= n; i++)
        tr[i].addl(s[i] - '0');
    for (int i = 1; i < n; i++)
    {
        scanf("%d%d", &x, &y);
        x = f(x), y = f(y);
        if (tr[x].sz > tr[y].sz)
        {
            for (int p = 0; p < tr[y].sz; p++)
                tr[x].addr(tr[y].dq[p]);
            printf("%d\n", tr[ds[y] = x].cnt - 2);
        }
        else
        {
            for (int p = tr[x].sz - 1; p >= 0; p--)
                tr[y].addl(tr[x].dq[p]);
            printf("%d\n", tr[ds[x] = y].cnt - 2);
        }
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:182:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  182 |     scanf("%d%s", &n, s + 1);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
Main.cpp:188:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  188 |         scanf("%d%d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 50 / 50