Submission #149692

#	Time	Username	Problem	Language	Result	Execution time	Memory
149692		USA1 (#200)	Trip to the Galapagos Islands (FXCUP4_island)	C++17	31 / 100	261 ms	26516 KiB

island

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

using namespace std;
const int MAXN = 100100;
const int BSIZE = 500;
const int NBUCK = 210;

int N, M;
int fval[MAXN];
int floc[MAXN];

int par[MAXN];
vector <int> guys[MAXN];
vector <int> dists[MAXN];

int ndist[MAXN];
int oloc[MAXN];
int nmin[MAXN][20];
int nhun[MAXN];

void uni (int left, int right, int now)
{
    left = par[left];
    right = par[right];
    if (left == right) return;
    if (guys[left].size() < guys[right].size()) swap (left, right);

    dists[left].push_back(now);
    for (int guy : guys[right])
    {
        guys[left].push_back(guy);
        par[guy] = left;
    }
    for (int dist : dists[right])
    {
        dists[left].push_back(dist);
    }
    guys[right].clear();
    dists[right].clear();
}

void Init(int K, std::vector<int> F, std::vector<int> S, std::vector<int> E){
	N = F.size(), M = S.size();
    for (int i = 0; i < N; i++)
    {
        fval[i] = F[i];
        floc[fval[i]] = i;
    }

    for (int i = 0; i < N; i++)
    {
        guys[i].clear();
        dists[i].clear();
        guys[i].push_back(i);
        par[i] = i;
    }

    for (int i = M - 1; i >= 0; i--)
    {
        int l = S[i], r = E[i];

        uni (l, r, i + 1);
    }

    int cp = par[0];
    for (int i = 0; i < N; i++)
    {
        if (i < N - 1)
            ndist[i] = dists[cp][i];
        oloc[guys[cp][i]] = i;
    }

    for (int i = 0; i < N; i++)
        nmin[i][0] = ndist[i];
    for (int a = 0; a < 19; a++)
    {
        for (int i = 0; i < N; i++)
        {
            nmin[i][a+1] = nmin[i][a];
            if (i + (1 << a) < N)
                nmin[i][a+1] = min (nmin[i][a], nmin[i+(1<<a)][a]);
        }
    }
}

int gogo (int x, int y)
{
    if (x > y) swap (x, y);
    int np = 31 - __builtin_clz(y - x);
    return min (nmin[x][np], nmin[y-(1<<np)][np]);
}

int Separate(int A, int B)
{
    return gogo (oloc[floc[A]], oloc[floc[B]]);
}

• Subtask 1: 31 / 31
• Subtask 2: 0 / 39
• Subtask 3: 0 / 30