Submission #626220

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
626220	2022-08-11T10:04:22 Z	TheLostCookie	Catfish Farm (IOI22_fish)	C++17	Compilation error	0 ms	0 KB

fish

#include <bits/stdc++.h>
#include "fish.h"
using namespace std;

typedef long long int lli;
typedef vector<lli> vi;
typedef pair<int,int> ii;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define ROF(i,a,b) for(int i=(b)-1;i>=(a);--i)
#define pb push_back
#define fi first
#define se second
#define all(v) begin(v),end(v)

const int INF = 2e9;

long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y, std::vector<int> W) {
	map<ii,lli> inc, dec;
	inc[{-1,-INF}] = inc[{-1,INF}] = 0;
	
	vector<pair<ii,lli>> ptw;
	FOR(i,0,M) ptw.pb({{X[i],Y[i]},W[i]});
	FOR(i,0,N) ptw.pb({{i,INF},0});
	sort(all(ptw));
	
	vector<ii> pts;
	vector<lli> wts{0};
	FOR(i,0,M+N) {
		pts.pb(ptw[i].fi);
		wts.pb(wts.back()+ptw[i].se);
	}
	
	//counts fish in [{x,y1},{x,y2}], inclusive of endpoints
	function<lli(lli,lli,lli)> countFish = [&] (lli x, lli y1, lli y2) {
		if(y1 > y2) return 0LL;
		else {
			int l = lower_bound(all(pts),ii{x,y1}) - begin(pts);
			int r = upper_bound(all(pts),ii{x,y2}) - begin(pts);
			return wts[r]-wts[l];
		}
	};
	
	FOR(i,0,N) {
		map<ii,lli> colInc[3];
		map<ii,lli> colDec;
	
		int l = lower_bound(all(pts), ii{i,0}) - begin(pts);
		int r = lower_bound(all(pts), ii{i+1,0}) - begin(pts);
		
		int p = lower_bound(all(pts), ii{i-2,0}) - begin(pts);
		FOR(j,l,r) {
			if(j>l) colInc[0][pts[j]]=max(colInc[0][pts[j]],colInc[0][pts[j-1]]);
			while(p<int(pts.size())&&pts[p].fi==i-2&&pts[p].se<=pts[j].se) {
				colInc[0][pts[j]]=max(colInc[0][pts[j]],dec[pts[p]]);
				p++;
			}
		}
		FOR(j,l,r) colInc[0][pts[j]] += countFish(i-1,0,pts[j].se-1);
		p = lower_bound(all(pts), ii{i-2,0}) - begin(pts);
		while(p<int(pts.size())&&pts[p].fi==i-2) colInc[1][pts[l]] = max(colInc[1][pts[l]],dec[pts[p]]+countFish(i-1,0,pts[p].se-1)),p++;
		FOR(j,l+1,r) colInc[1][pts[j]] = max(colInc[1][pts[j]],colInc[1][pts[j-1]]);
		
		p = lower_bound(all(pts), ii{i-1,0}) - begin(pts);
		FOR(j,l,r) {
			if(j>l) colInc[2][pts[j]]=max(colInc[2][pts[j]],colInc[2][pts[j-1]]+countFish(i-1,pts[j-1].se,pts[j].se-1));
			while(p<int(pts.size())&&pts[p].fi==i-1&&pts[p].se<=pts[j].se) {
				colInc[2][pts[j]]=max(colInc[2][pts[j]],inc[pts[p]]+countFish(i-1,pts[p].se,pts[j].se-1));
				p++;
			}
		}
		
		p = lower_bound(all(pts), ii{i-1,INF}) - begin(pts);
		ROF(j,l,r) {
			if(i>0&&j<r-1) colDec[pts[j]]=max(colDec[pts[j]],colDec[pts[j+1]]+countFish(i,pts[j].se,pts[j+1].se-1));
			while(p>=0&&pts[p].fi==i-1&&pts[p].se>=pts[j].se) {
				colDec[pts[j]]=max(colDec[pts[j]],dec[pts[p]]+countFish(i,pts[j].se,pts[p].se-1));
				p--;
			}
		}
		
		FOR(j,l,r) {
			FOR(k,0,3) {
				inc[pts[j]] = max(inc[pts[j]],colInc[k][pts[j]]);
			}
			dec[pts[j]] = max(dec[pts[j]],colDec[pts[j]]);
		}
		dec[ii{i,INF}] = max(inc[ii{i,INF}],dec[ii{i,INF}]);
		
		while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
		while(!dec.empty() && dec.begin()->first < i-1) dec.erase(dec.begin()); 
	}
	
	lli ans = max(inc[{N-1,INF}],dec.lower_bound({N-1,0})->second);
	
	return ans;
}

Compilation message

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:90:44: error: no match for 'operator<' (operand types are 'const std::pair<int, int>' and 'int')
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                         ~~~~~~~~~~~~~~~~~~ ^ ~~~
      |                                      |        |
      |                                      |        int
      |                                      const std::pair<int, int>
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from fish.cpp:1:
/usr/include/c++/10/bits/regex.h:1075:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)'
 1075 |     operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1075:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from fish.cpp:1:
/usr/include/c++/10/bits/regex.h:1156:5: 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>&)'
 1156 |     operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1156:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from fish.cpp:1:
/usr/include/c++/10/bits/regex.h:1249:5: 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>&)'
 1249 |     operator<(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1249:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from fish.cpp:1:
/usr/include/c++/10/bits/regex.h:1323:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&)'
 1323 |     operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1323:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from fish.cpp:1:
/usr/include/c++/10/bits/regex.h:1417:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1417 |     operator<(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1417:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from fish.cpp:1:
/usr/include/c++/10/bits/regex.h:1492:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type&, const std::__cxx11::sub_match<_BiIter>&)'
 1492 |     operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1492:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from fish.cpp:1:
/usr/include/c++/10/bits/regex.h:1592:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1592 |     operator<(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1592:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from fish.cpp:1:
/usr/include/c++/10/bits/stl_pair.h:489:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)'
  489 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_pair.h:489:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from fish.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:366:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)'
  366 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:366:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from fish.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:404:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)'
  404 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:404:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from fish.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:1451:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)'
 1451 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:1451:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::move_iterator<_IteratorL>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from fish.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:1507:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)'
 1507 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:1507:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::move_iterator<_IteratorL>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/basic_string.h:48,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from fish.cpp:1:
/usr/include/c++/10/string_view:544:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)'
  544 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/10/string_view:544:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'std::pair<int, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/basic_string.h:48,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from fish.cpp:1:
/usr/include/c++/10/string_view:550:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(std::basic_string_view<_CharT, _Traits>, std::__type_identity_t<std::basic_string_view<_CharT, _Traits> >)'
  550 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/10/string_view:550:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'std::pair<int, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/basic_string.h:48,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from fish.cpp:1:
/usr/include/c++/10/string_view:557:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(std::__type_identity_t<std::basic_string_view<_CharT, _Traits> >, std::basic_string_view<_CharT, _Traits>)'
  557 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/10/string_view:557:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from fish.cpp:1:
/usr/include/c++/10/bits/basic_string.h:6267:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&, const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 6267 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/basic_string.h:6267:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from fish.cpp:1:
/usr/include/c++/10/bits/basic_string.h:6280:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 6280 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/basic_string.h:6280:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   'const std::pair<int, int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from fish.cpp:1:
/usr/include/c++/10/bits/basic_string.h:6292:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 6292 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/basic_string.h:6292:5: note:   template argument deduction/substitution failed:
fish.cpp:90:48: note:   mismatched types 'const _CharT*' and 'std::pair<int, int>'
   90 |   while(!inc.empty() && inc.begin()->first < i-1) inc.erase(inc.begin());
      |                                                ^
In file included from /usr/include/c++/10/bits/ios_base.h:46,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,