Submission #102777

#	Time	Username	Problem	Language	Result	Execution time	Memory
102777		naoai	Rail (IOI14_rail)	C++14	30 / 100	3072 ms	263168 KiB

rail

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

using namespace std;

const int nmax = 5000;

bool fix[nmax + 1];
int v[nmax + 1], tip[nmax + 1];

int mn[nmax + 1];
vector<pair<int, int>> d[nmax + 1];

int val[nmax + 1][nmax + 1];

struct str {
    int i, j, x;

    str () {}
    str (int _i, int _j, int _x) {
        i = _i, j = _j, x = _x;
    }
};
vector<str> vc;

const int valmax = 2e6 + 5;
static int cnt[valmax + 1];

void findLocation(int N, int first, int location[], int stype[]) {
    for (int i = 0; i < N; ++ i)
        for (int j = i + 1; j < N; ++ j) {
            int x = getDistance(i, j);
            val[i][j] = x;
            ++ cnt[x];
        }

    for (int i = 1; i <= valmax; ++ i)
        cnt[i] += cnt[i - 1];

    vc.resize(N * (N - 1) / 2);
    for (int i = 0; i < N; ++ i) {
        for (int j = i + 1; j < N; ++ j) {
            vc[-- cnt[val[i][j]]] = str(i, j, val[i][j]);
        }
    }

    for (auto i : vc) {
        d[i.i].push_back({i.x, i.j});
        d[i.j].push_back({i.x, i.i});
    }

    v[0] = first;
    tip[0] = 1;
    fix[0] = 1;
    for (int step = 0; step < N - 1; ++ step) {
        int x, y, e = 1 << 30;
        x = y = -1;

        for (int i = 0; i < N; ++ i) {
            if (fix[i] == 1) {
                while (mn[i] < N - 1 && fix[d[i][mn[i]].second] == 1)
                    ++ mn[i];

                if (mn[i] < N - 1 && d[i][mn[i]].first < e) {
                    x = i;
                    y = d[i][mn[i]].second;
                    e = d[i][mn[i]].first;
                }
            }
        }

        if (tip[x] == 1) {
            v[y] = v[x] + e;
            tip[y] = 2;
        } else {
            v[y] = v[x] - e;
            tip[y] = 1;
        }
        fix[y] = 1;
    }

    for (int i = 0; i < N; ++ i) {
        location[i] = v[i];
        stype[i] = tip[i];
    }
}

• Subtask 1: 8 / 8
• Subtask 2: 22 / 22
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44