Submission #567067

#	Time	Username	Problem	Language	Result	Execution time	Memory
567067		hibiki	Fun Tour (APIO20_fun)	C++11	10 / 100	1 ms	340 KiB

fun

#include "fun.h"
#include<bits/stdc++.h>
using namespace std;

#define pb push_back
#define f first
#define s second

int n,q,mid;
int dist[100005];
vector<int> head,sz,ans;
vector<pair<int,int> > nh[3];

int fi_mid()
{
    int base = 0, po, best, midbase = n / 2;
    int ret = attractionsBehind(1, 0);
    int more = max(ret, n - ret + 1);
    best = more - midbase;
    po = 0;
    for(int i = 1; i < n; i++)
    {
        ret = attractionsBehind(base, i);
        more = max(ret, n - ret + 1);
        if(more - midbase < best)
        {
            best = more - midbase;
            po = i;
        }
    }
    return po;
}

void fi_dist()
{
    for(int i = 0; i < n; i++)
    {
        if(i == mid) dist[i] = 0;
        else dist[i] = hoursRequired(i, mid);
        if(dist[i] == 1)
        {
            head.pb(i);
            sz.pb(n - attractionsBehind(i, mid));
        }
    }
}

void fi_nh()
{
    int ti = 0;
    for(int i = 0; i < n; i++)
    {
        if(i == mid) continue;
        if(dist[i] == 1)
        {
            nh[ti++].pb({dist[i], i});
            continue;
        }
        int ask0 = attractionsBehind(i, head[0]);
        int ask1 = attractionsBehind(i, head[1]);
        if(ask0 != sz[0])
            nh[0].pb({dist[i],i});
        else if(ask1 != sz[1])
            nh[1].pb({dist[i],i});
        else
            nh[2].pb({dist[i],i});
    }
}

vector<int> createFunTour(int N, int Q)
{
    n = N, q = Q;
    mid = fi_mid();
    // printf("p1\n");
    fi_dist();
    // printf("p2\n");
    fi_nh();
    // printf("p3\n");
    // printf("%d %d\n",mid,head.size());
    // for(int i = 0; i < nh[2].size(); i++)
    //     printf("%d ",nh[2][i].s);
    // printf("\n");
    int idx_last[3] = {-1,-1,-1};
    int cur,last,best = 0;
    for(int i = 0; i < head.size(); i++)
    {
        sort(nh[i].begin(),nh[i].end());
        idx_last[i] = nh[i].size() - 1;
        if(nh[i][idx_last[i]].f > best)
        {
            cur = i;
            last = nh[i][idx_last[i]].s;
            best = nh[i][idx_last[i]].f;
        }
    }
    ans.pb(last);
    idx_last[cur]--;
    // printf("%d\n",last);
    for(int i = 1; i < n - 1; i++)
    {
        best = 0;
        int prev_cur = cur;
        for(int j = 0; j < head.size(); j++)
        {
            if(j == prev_cur || idx_last[j] == -1) continue;
            if(nh[j][idx_last[j]].f > best)
            {
                cur = j;
                last = nh[j][idx_last[j]].s;
                best = nh[j][idx_last[j]].f;
            }
        }
        ans.pb(last);
        // printf("%d\n",last);
        idx_last[cur]--;
    }
    ans.pb(mid);
    // printf("%d\n",mid);
    return ans;
}

Compilation message (stderr)

fun.cpp: In function 'std::vector<int> createFunTour(int, int)':
fun.cpp:85:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |     for(int i = 0; i < head.size(); i++)
      |                    ~~^~~~~~~~~~~~~
fun.cpp:103:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  103 |         for(int j = 0; j < head.size(); j++)
      |                        ~~^~~~~~~~~~~~~
fun.cpp:97:17: warning: 'cur' may be used uninitialized in this function [-Wmaybe-uninitialized]
   97 |     idx_last[cur]--;
      |     ~~~~~~~~~~~~^

• Subtask 1: 10 / 10
• Subtask 2: 0 / 16
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 34