Submission #1106021

#	Time	Username	Problem	Language	Result	Execution time	Memory
1106021		jerzyk	Hieroglyphs (IOI24_hieroglyphs)	C++17	19 / 100	155 ms	33448 KiB

hieroglyphs

#include <bits/stdc++.h>
#include "hieroglyphs.h"

using namespace std;
#define pb push_back
#define st first
#define nd second
typedef long long ll;
typedef long double ld;
const ll I = 1000LL * 1000LL * 1000LL * 1000LL * 1000LL * 1000LL;
const int II = 2 * 1000 * 1000 * 1000;
const int N = 300 * 1000 + 7;
int tab[N][2], nxt[N][2], rev[N];
map<int, int> scl;
vector<int> pos[N][2];
set<int>::iterator it;

int Il(int a, int i, int r)
{
    //cout << "Il: " << a << " " << i << " " << r << " " << (pos[a][r].size()) << "\n";
    return (pos[a][r].end() - lower_bound(pos[a][r].begin(), pos[a][r].end(), i));
}

int Nxt(int a, int i, int r)
{
    int j = (upper_bound(pos[a][r].begin(), pos[a][r].end(), i) - pos[a][r].begin());
    if(j == (int)pos[a][r].size())
        return N - 3;
    return pos[a][r][j];
}

void Scl(int n, int m)
{
    vector<int> v;
    for(int i = 1; i <= n; ++i)
        v.pb(tab[i][0]);
    for(int i = 1; i <= m; ++i)
        v.pb(tab[i][1]);
    sort(v.begin(), v.end());
    int l = -1;
    for(int i = 0; i < (int)v.size(); ++i)
    {
        if(i == 0 || v[i] != v[i - 1]) ++l;
        scl[v[i]] = l; rev[l] = v[i];
    }
    for(int i = 1; i <= n; ++i)
    {
        tab[i][0] = scl[tab[i][0]];
        pos[tab[i][0]][0].pb(i);
    }
    for(int i = 1; i <= m; ++i)
    {
        tab[i][1] = scl[tab[i][1]];
        pos[tab[i][1]][1].pb(i);
    }
}

void Gen(int n, int m)
{
    nxt[n + 1][0] = n + 1;
    nxt[m + 1][1] = m + 1;
    for(int i = n; i >= 1; --i)
    {
        nxt[i][0] = nxt[i + 1][0];
        if((int)pos[tab[i][0]][0].size() <= (int)pos[tab[i][0]][1].size())
            nxt[i][0] = i;
    }
    for(int i = m; i >= 1; --i)
    {
        nxt[i][1] = nxt[i + 1][1];
        if((int)pos[tab[i][1]][1].size() <= (int)pos[tab[i][1]][0].size())
            nxt[i][1] = i;
    }
    nxt[0][0] = nxt[1][0];
    nxt[0][1] = nxt[1][1];
}

vector<int> ucs(vector<int> A, vector<int> B)
{
    int n = A.size(), m = B.size();
    vector<int> answer, fans = {-1};
    for(int i = 0; i < n; ++i)
        tab[i + 1][0] = A[i];
    for(int i = 0; i < m; ++i)
        tab[i + 1][1] = B[i];
    Scl(n, m);
    Gen(n, m);
    tab[n + 1][0] = N - 6; tab[m + 1][1] = N - 5;
    int i = 0, j = 0;
    while(i < n && j < m)
    {
        int a = tab[nxt[i + 1][0]][0], b = tab[nxt[j + 1][1]][1];
        if(nxt[i + 1][0] > n && nxt[j + 1][1] > m) break;
        if(a == b)
        {
            answer.pb(rev[a]);
            i = nxt[i + 1][0]; j = nxt[j + 1][1];
            continue;
        }
        int il1 = Il(a, i + 1, 0), il2 = Il(b, j + 1, 1);
        //int n1 = Nxt(a, 1, nxt[j + 1][1]), n2 = Nxt(b, 0, nxt[i + 1][0]);
        bool cz1 = (Nxt(a, j, 1) < nxt[j + 1][1] && Il(b, nxt[i + 1][0], 0) >= il2);
        bool cz2 = (Nxt(b, i, 0) < nxt[i + 1][0] && Il(a, nxt[j + 1][1], 1) >= il1);
        //cout << a << " " << b << "\n";
        //cout << i << " " << j << " " << nxt[i + 1][0] << " " << nxt[j + 1][1] << "\n";
        //cout << Il(b, nxt[i + 1][0], 0) << " " << Il(a, nxt[j + 1][1], 1) << "\n";
        //cout << il1 << " " << il2 << "\n";
        //cout << cz1 << " " << cz2 << "\n";
        if(!(cz1 ^ cz2))
            return fans;
        if(cz1)
        {
            i = nxt[i + 1][0];
            j = Nxt(a, j, 1);
        }else
        {
            i = Nxt(b, i, 0);
            j = nxt[j + 1][1];
        }
        answer.pb(rev[tab[i][0]]);
    }
    int anss = 0;
    for(int i = 0; i <= n + m; ++i)
        anss += (int)min(pos[i][0].size(), pos[i][1].size());
    if(anss != (int)answer.size())
        return fans;
    return answer;
}

• Subtask 0: 0 / 0
• Subtask 1: 3 / 3
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 16 / 16
• Subtask 5: 0 / 14
• Subtask 6: 0 / 42