답안 #63103

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
63103 2018-07-31T16:55:23 Z bazsi700 조교 (CEOI16_popeala) C++14
컴파일 오류
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#include <bits/stdc++.h>
using namespace std;

#define MOD 1000000007
#define ll long long int
#define vi vector<int>
#define vii vector< vector<int> >
#define PI 3.1415926535897932384626433832795
#define INF 9223372036854775807LL

bool solved[51][20001];
int dp[20001][51];
int minval[20002][52][52];
int prefsum[20002];
int conssolved[51][20001]; //[x][y]=z means, the xth solved y-z+1,y-z+2,...,y tasks but not the y-z th

int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	int n,t,s;
	cin >> n >> t >> s;
	vi p(t+1);
	for(int i = 1; i <= t; i++) {
		cin >> p[i];
		prefsum[i] = prefsum[i-1]+p[i];
	}
	vector<vector<int> > solves (t+1,vi(n));
	for(int i = 1; i <= n; i++) {
		int lastnotsolv = 0;
		for(int j = 1; j <= t; j++) {
			char ch;
			cin >> ch;
			solved[i][j] = (ch == '1');
			if(!solved[i][j]) {
				lastnotsolv = j;
			}
			conssolved[i][j] = j-lastnotsolv;
		}
	}
	for(int i = 1; i <= t; i++) {
		for(int st = 1; st <= n; st++) {
			solves[i][st-1] = (conssolved[st][i]);
		}
		sort(solves[i].begin(),solves[i].end());
	}
	int sum = 0;
	for(int j = 0; j <= s; j++) {
		for(int i = 0; i <= t; i++) {
			for(int per = 0; per <= n; per++) {
				minval[i][j][per] = 2*MOD;
			}
		}
	}
	for(int i = 1; i <= t; i++) {
		sum+= p[i];
		int solv = 0;
		for(int j = 1; j <= n; j++) {
			if(conssolved[j][i] == i) {
				solv++;
			}
		}
		dp[i][1] = solv*sum;
		for(int pers = 0; pers <= n; pers++) {
			minval[i][2][pers] = min(minval[i-1][2][pers]+pers*p[i],dp[i][1]);
		}
	}
	for(int j = 2; j <= s; j++) {
		for(int i = 1; i <= t; i++) {
		//	for(int st = 1; st <= n; st++) {
		//		solves[st-1] = (conssolved[st][i]);
		//	}
		//	sort(solves.begin(),solves.end());
			int ind = 0;
			sum = prefsum[i]-prefsum[i-1];
			dp[i][j] = minval[i-1][j][n-ind]+sum*(n-ind);
			for(int currsiz : solves[i]) {
				currsiz++;
				if(currsiz > i-j+1) {
					break;
				}
				while(ind < n && solves[ind] < currsiz) {
					ind++;
				}
				sum = prefsum[i]-prefsum[i-currsiz];
				if(dp[i][j] == dp[i][j-1]) {
					break;
				}
				dp[i][j] = min(dp[i][j],minval[i-currsiz][j][n-ind]+sum*(n-ind));
			}
			for(int pers = 0; pers <= n; pers++) {
				minval[i][j+1][pers] = min(minval[i-1][j+1][pers]+pers*p[i],dp[i][j]);
			}
		}
	}
	for(int i = 1; i <= s; i++) {
		cout << dp[t][i] << "\n";
	}
	return 0;
}

Compilation message

popeala.cpp: In function 'int main()':
popeala.cpp:81:34: error: no match for 'operator<' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' and 'int')
     while(ind < n && solves[ind] < currsiz) {
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/regex.h:962:5: note: candidate: template<class _BiIter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)
     operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:962:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/regex.h:1041:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const std::__cxx11::sub_match<_BiIter>&)
     operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1041:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/regex.h:1121:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)
     operator<(const sub_match<_Bi_iter>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1121:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/regex.h:1198:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&)
     operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1198:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/regex.h:1272:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)
     operator<(const sub_match<_Bi_iter>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1272:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/regex.h:1349:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type&, const std::__cxx11::sub_match<_BiIter>&)
     operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1349:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/regex.h:1429:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)
     operator<(const sub_match<_Bi_iter>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1429:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/future:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:105,
                 from popeala.cpp:1:
/usr/include/c++/7/thread:281:3: note: candidate: bool std::operator<(std::thread::id, std::thread::id)
   operator<(thread::id __x, thread::id __y) noexcept
   ^~~~~~~~
/usr/include/c++/7/thread:281:3: note:   no known conversion for argument 1 from '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' to 'std::thread::id'
In file included from /usr/include/c++/7/forward_list:38:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:104,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/forward_list.h:1391:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator<(const std::forward_list<_Tp, _Alloc>&, const std::forward_list<_Tp, _Alloc>&)
     operator<(const forward_list<_Tp, _Alloc>& __lx,
     ^~~~~~~~
/usr/include/c++/7/bits/forward_list.h:1391:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::forward_list<_Tp, _Alloc>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from popeala.cpp:1:
/usr/include/c++/7/valarray:1186:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/7/valarray:1186:1: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from popeala.cpp:1:
/usr/include/c++/7/valarray:1186:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/7/valarray:1186:1: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::valarray<_Tp>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from popeala.cpp:1:
/usr/include/c++/7/valarray:1186:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/7/valarray:1186:1: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::valarray<_Tp>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<, __less)
     ^
/usr/include/c++/7/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<, __less)
     ^
/usr/include/c++/7/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<, __less)
     ^
/usr/include/c++/7/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)
     _DEFINE_EXPR_BINARY_OPERATOR(<, __less)
     ^
/usr/include/c++/7/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__less, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<, __less)
     ^
/usr/include/c++/7/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/stack:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:89,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/stl_stack.h:311:5: note: candidate: template<class _Tp, class _Seq> bool std::operator<(const std::stack<_Tp, _Seq>&, const std::stack<_Tp, _Seq>&)
     operator<(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_stack.h:311:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::stack<_Tp, _Seq>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/set:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/stl_multiset.h:913:5: note: candidate: template<class _Key, class _Compare, class _Alloc> bool std::operator<(const std::multiset<_Key, _Compare, _Alloc>&, const std::multiset<_Key, _Compare, _Alloc>&)
     operator<(const multiset<_Key, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_multiset.h:913:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::multiset<_Key, _Compare, _Alloc>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/stl_set.h:930:5: note: candidate: template<class _Key, class _Compare, class _Alloc> bool std::operator<(const std::set<_Key, _Compare, _Alloc>&, const std::set<_Key, _Compare, _Alloc>&)
     operator<(const set<_Key, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_set.h:930:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::set<_Key, _Compare, _Alloc>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/queue:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:86,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/stl_queue.h:336:5: note: candidate: template<class _Tp, class _Seq> bool std::operator<(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)
     operator<(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_queue.h:336:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> > >::value_type {aka std::vector<int>}' is not derived from 'const std::queue<_Tp, _Seq>'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/vector:64:0,
                 from /usr/include/c++/7/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:86,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/stl_vector.h:1613:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator<(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator<(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_vector.h:1613:5: note:   template argument deduction/substitution failed:
popeala.cpp:81:36: note:   mismatched types 'const std::vector<_Tp, _Alloc>' and 'int'
     while(ind < n && solves[ind] < currsiz) {
                                    ^~~~~~~
In file included from /usr/include/c++/7/memory:81:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:82,
                 from popeala.cpp:1:
/usr/include/c++/7/bits/shared_ptr.h:416:5: note: candidate: template<class _Tp> bool std::operator<(std::nullptr_t, const std::shared_ptr<_Tp>&)
     operator<(nullptr_t, const shared