Submission #640348

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
640348	2022-09-14 10:07:38	PoonYaPat	Roadside Advertisements (NOI17_roadsideadverts)	C++14	100 / 100	78 ms	11028 KiB

roadsideadverts

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#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
int n,m,a[6];
vector<pii> adj[50001];
int level[50001],p[50001][17],dis[50001];
void dfs(int x, int par) {
    level[x]=level[par]+1;
    p[x][0]=par;
    for (int i=1; i<=16; ++i) {
        p[x][i]=p[p[x][i-1]][i-1];
    }
    for (auto s : adj[x]) {
        if (s.first==par) continue;
        dis[s.first]=dis[x]+s.second;
        dfs(s.first,x);
    }
}
int lca(int x, int y) {
    if (level[x]<level[y]) swap(x,y);
    int dif=level[x]-level[y];
    for (int i=0; i<=16; ++i) {
        if (dif&(1<<i)) x=p[x][i];
    }
    if (x==y) return x;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

roadsideadverts.cpp: In function 'void solve()':
roadsideadverts.cpp:42:35: warning: 'top_node' may be used uninitialized in this function [-Wmaybe-uninitialized]
   42 |     return dis[x]+dis[y]-2*dis[lca(x,y)];
      |                                ~~~^~~~~
roadsideadverts.cpp:47:9: note: 'top_node' was declared here
   47 |     int top_node, min_level=INT_MAX;
      |         ^~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 23 / 23
• Subtask 3: 40 / 40
• Subtask 4: 30 / 30