Submission #300769

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
300769	2020-09-17 13:20:13	vipghn2003	Ball Machine (BOI13_ballmachine)	C++14	100 / 100	282 ms	32380 KiB

ballmachine

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include<bits/stdc++.h>
#define fi first
#define se second
#define pii pair<int,int>
#define mp make_pair
using namespace std;
const int N=1e5+5;
int n,q,mn[N],pos[N],cnt,col[N],p[N][20];
vector<int>adj[N];
void dfs(int u,int par=-1)
{
    for(int i=1;i<=18;i++) p[u][i]=p[p[u][i-1]][i-1];
    mn[u]=u;
    for(auto&v:adj[u])
    {
        if(v==par) continue;
        p[v][0]=u;
        dfs(v,u);
        mn[u]=min(mn[u],mn[v]);
    }
}
void go(int u,int par=-1)
{
    vector<pii>order;
    for(auto&v:adj[u]) if(v!=par) order.push_back(mp(mn[v],v));
    sort(order.begin(),order.end());
    for(auto&v:order) go(v.se,u);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Compilation message (stderr)

ballmachine.cpp: In function 'int main()':
ballmachine.cpp:48:7: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
   48 |     go(root);
      |     ~~^~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40
• Subtask 4: 5 / 5