Submission #984756

#	Time	Username	Problem	Language	Result	Execution time	Memory
984756		Muhammad_Aneeq	사이버랜드 (APIO23_cyberland)	C++17	21 / 100	38 ms	14684 KiB

cyberland

#include "cyberland.h"
#include <vector>
#include <map>
#include <set>
#include <iostream>
using namespace std;
int const MAXN=1e5+10;
vector<pair<int,int>>nei[MAXN];
int val[MAXN];
bool vis[MAXN]={},ra[MAXN]={};
int h;
map<pair<int,int>,int>d;
void dfs(int x)
{
    ra[x]=1;
    vis[x]=1;
    for (auto [i,j]:nei[x])
    {
        if (!vis[i]&&i!=h)
            dfs(i);
    }
}
vector<int>p;
int k;
double ans=1e15+10;
void dfs1(int x)
{
    vis[x]=1;
    p.push_back(x);
    if (val[x]==0||x==0)
    {
        double su=0;
        vector<int>va;
        for (int i=p.size()-1;i>=0;i--)
        {
            if (val[p[i]]==2)
                va.push_back(p[i]);
        }
        int x=max(0,int(va.size()-k));
        bool w=0;
        for (int i=p.size()-1;i>=1;i--)
        {
            if (va.size()&&p[i-1]==va[x])
                w=1;
            su+=d[{p[i],p[i-1]}];
            if (w&&val[p[i-1]]==2)
                su/=2.0;
        }
        ans=min(ans,su);
        if (p.size())
            p.pop_back();
        return;
    }
    for (auto [i,j]:nei[x])
    {
        if (ra[i]&&!vis[i])
            dfs1(i);
    }
    if (p.size())
        p.pop_back();
}
double solve(int N, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) 
{
    h=H;
    k=K;
    ans=1e15+10;
    d={};
    p={};
    for (int i=0;i<N;i++)
    {
        nei[i]={};
        val[i]=arr[i];
        vis[i]=0;
        ra[i]=0;
    }
    for (int i=0;i<x.size();i++)
    {   
        d[{x[i],y[i]}]=d[{y[i],x[i]}]=c[i];
        nei[x[i]].push_back({y[i],c[i]});
        nei[y[i]].push_back({x[i],c[i]});
    }
    dfs(0);
    for (int i=0;i<N;i++)
        vis[i]=0;
    dfs1(h);
    if (ans==1e15+10)
        return -1;
    return ans;
}

Compilation message (stderr)

cyberland.cpp: In function 'double solve(int, int, int, int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
cyberland.cpp:76:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for (int i=0;i<x.size();i++)
      |                  ~^~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 0 / 19
• Subtask 5: 0 / 7
• Subtask 6: 0 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3