#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
using namespace std;
const int N=5e5+5;
int n;
vector < int > v[N];
pair < ll , ll > D[N],T[N],ans;
void Dfs(int x,int p) {
for (int i=0; i<v[x].size(); i++)
if (v[x][i]==p) { swap(v[x][i],v[x][v[x].size()-1]); v[x].pop_back(); break; }
for (int i=0; i<v[x].size(); i++) {
int to=v[x][i];
Dfs(to,x);
if (D[to].F>D[x].F) D[x]=D[to];
else
if (D[to].F==D[x].F) D[x].S+=D[to].S;
}
D[x].F++;
if (!v[x].size()) D[x].S=1;
}
void Ufs(int x) {
pair < int , int > M1,M2;
M1.F=M1.S=M2.F=M2.S=-1;
M1=D[x],M1.F--;
for (int i=0; i<v[x].size(); i++) {
int to=v[x][i];
if (M1.F==D[to].F) continue;
if (M2.F<D[to].F) M2=D[to];
else
if (M2.F==D[to].F) M2.S+=D[to].S;
}
if (x==1) T[x].S=1;
for (int i=0; i<v[x].size(); i++) {
int to=v[x][i];
if (M1.F==D[to].F && M1.S==D[to].S) T[to]=M2;
else
if (M1.F==D[to].F && M1.S>D[to].S) T[to].F=M1.F,T[to].S=M1.S-D[to].S;
else T[to]=M1;
if (T[x].F>T[to].F) T[to]=T[x];
else
if (T[x].F==T[to].F) T[to].S+=T[x].S;
T[to].F++;
Ufs(to);
}
}
void Df(int x) {
vector < pair < ll , ll > > s;
s.push_back(T[x]);
for (int i=0; i<v[x].size(); i++)
s.push_back(D[v[x][i]]);
sort(s.begin(),s.end());
reverse(s.begin(),s.end());
if (s.size()>=3) {
ll g=s[0].F*(s[1].F+s[2].F),tot=0,sum=0;
if (s[0].F==s[1].F && s[1].F==s[2].F) {
for (int i=0; i<s.size(); i++)
if (s[0].F==s[i].F) tot+=s[i].S*sum,sum+=s[i].S;
}
else
if (s[0].F==s[1].F) {
for (int i=3; i<s.size(); i++)
if (s[2].F==s[i].F) s[2].S+=s[i].S;
tot=s[0].S*s[2].S+s[1].S*s[2].S;
}
else tot=s[1].S*s[2].S;
if (ans.F<g) ans.F=g,ans.S=tot;
else
if (ans.F==g) ans.S+=tot;
}
for (int i=0; i<v[x].size(); i++)
Df(v[x][i]);
}
main () {
scanf("%d",&n);
for (int i=1; i<n; i++) {
int a,b;
scanf("%d%d",&a,&b);
v[a].push_back(b);
v[b].push_back(a);
}
Dfs(1,1);
Ufs(1);
Df(1);
if (!ans.F) ans.S=1;
printf("%lld %lld \n",ans.F,ans.S);
}
Compilation message
road.cpp: In function 'void Dfs(int, int)':
road.cpp:11:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<v[x].size(); i++)
~^~~~~~~~~~~~
road.cpp:14:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<v[x].size(); i++) {
~^~~~~~~~~~~~
road.cpp: In function 'void Ufs(int)':
road.cpp:31:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<v[x].size(); i++) {
~^~~~~~~~~~~~
road.cpp:41:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<v[x].size(); i++) {
~^~~~~~~~~~~~
road.cpp: In function 'void Df(int)':
road.cpp:59:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<v[x].size(); i++)
~^~~~~~~~~~~~
road.cpp:69:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<s.size(); i++)
~^~~~~~~~~
road.cpp:74:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=3; i<s.size(); i++)
~^~~~~~~~~
road.cpp:85:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0; i<v[x].size(); i++)
~^~~~~~~~~~~~
road.cpp: At global scope:
road.cpp:89:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main () {
^
road.cpp: In function 'int main()':
road.cpp:90:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
road.cpp:94:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&a,&b);
~~~~~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
16 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
15 ms |
12128 KB |
Output is correct |
| 3 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 4 |
Incorrect |
16 ms |
12024 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
16 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
15 ms |
12128 KB |
Output is correct |
| 3 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 4 |
Incorrect |
16 ms |
12024 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
16 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
15 ms |
12128 KB |
Output is correct |
| 3 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 4 |
Incorrect |
16 ms |
12024 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
