Submission #342974

#	Time	Username	Problem	Language	Result	Execution time	Memory
342974		leinad2	Village (BOI20_village)	C++17	0 / 100	2 ms	2668 KiB

Village

#include<bits/stdc++.h>
using namespace std;
int n, i, j, k, a, b, ans[100010], A[100010], res, cent, sz[100010], dep[100010], in[100010], cnt;
vector<int>adj[100010];
void dfs(int v, int par, int depth)
{
    in[v]=++cnt;
    dep[v]=depth;
    sz[v]=1;
    for(int i=0;i<adj[v].size();i++)
    {
        int p=adj[v][i];
        if(p==par)continue;
        dfs(p, v, depth+1);
        sz[v]+=sz[p];
    }
}
int centroid(int v, int par)
{
    for(int i=0;i<adj[v].size();i++)
    {
        int p=adj[v][i];
        if(p==par)continue;
        if(sz[p]*2>n)
        {
            return centroid(p, v);
        }
    }
    return v;
}
int f(int x)
{
    return ((x+(n/2))%n==0?n:(x+(n/2))%n);
}
int main()
{
    for(scanf("%d", &n);++i<n;)
    {
        scanf("%d %d", &a, &b);
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    dfs(1, 0, 0);
    cent=centroid(1, 0);
    cnt=0;
    dfs(cent, 0, 0);
    for(i=0;i++<n;)res+=dep[i]*2;
    for(i=0;i++<n;)
    {
        ans[in[i]]=in[f(i)];
    }
    printf("1 %d\n", res);
    for(i=0;i++<n;)printf("1 ");
    puts("");
    for(i=0;i++<n;)
    {
        printf("%d ", ans[i]);
    }
}

Compilation message (stderr)

Village.cpp: In function 'void dfs(int, int, int)':
Village.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<adj[v].size();i++)
      |                 ~^~~~~~~~~~~~~~
Village.cpp: In function 'int centroid(int, int)':
Village.cpp:20:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |     for(int i=0;i<adj[v].size();i++)
      |                 ~^~~~~~~~~~~~~~
Village.cpp: In function 'int main()':
Village.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |     for(scanf("%d", &n);++i<n;)
      |         ~~~~~^~~~~~~~~~
Village.cpp:39:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |         scanf("%d %d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 38
• Subtask 3: 0 / 50