Language: C++

#include <iostream>
#include<iomanip>
#include <string>
#include<vector>
#include<algorithm>
#include<utility>
#include<queue>
#include<math.h>
#include<stack>
#include<set>
#include<map>
#include<ctime>
#include<cstdlib>
#define INF 1001001001001001001
#define rep(i,n,m) for(int i=n;i<m;i++)

using namespace std;

vector<int>p[100001];

int main() {
	int n;
	cin >> n;

	vector<pair<int, int>>a(n);
	rep(i, 1, n) {
		int x, y;
		cin >> x >> y;
		a[i] = { x,y };
		p[x].push_back(y);
		p[y].push_back(x);
	}

	unsigned int m = 0;
	rep(i, 1, n)m = max(m, p[i].size());
	cout << m << endl;
	vector<int>count(n + 1, 1);
	rep(i, 1, n) {
		if (count[a[i].first] <= count[a[i].second]) {
			cout << count[a[i].second] << endl;
			count[a[i].second]++;
		}
		else {
			cout << count[a[i].first] << endl;
			count[a[i].first]++;
		}
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:35:28: error: no matching function for call to 'max(unsigned int&, std::vector<int>::size_type)'
   35 |         rep(i, 1, n)m = max(m, p[i].size());
      |                         ~~~^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:35:28: note:   deduced conflicting types for parameter 'const _Tp' ('unsigned int' and 'std::vector<int>::size_type' {aka 'long unsigned int'})
   35 |         rep(i, 1, n)m = max(m, p[i].size());
      |                         ~~~^~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:5:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:35:28: note:   mismatched types 'std::initializer_list<_Tp>' and 'unsigned int'
   35 |         rep(i, 1, n)m = max(m, p[i].size());
      |                         ~~~^~~~~~~~~~~~~~~~