Submission #74041

#TimeUsernameProblemLanguageResultExecution timeMemory
74041kingpig9Fortune Telling 2 (JOI14_fortune_telling2)C++11
Compilation error
0 ms0 KiB
#include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace std; using namespace __gnu_pbds; typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; template<class T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; #define debug(...) fprintf(stderr, __VA_ARGS__) //#define debug(...) #define fi first #define se second #define all(v) (v).begin(), (v).end() #define fillchar(a, s) memset((a), (s), sizeof(a)) const int MAXN = 1 << 20; struct segtree { int tr[2 * MAXN]; segtree() { for (int i = 0; i < 2 * MAXN; i++) { tr[i] = -1e9; } } void update (int x, int v) { x += MAXN; tr[x] = v; while (x >>= 1) { tr[x] = max(tr[2 * x], tr[2 * x + 1]); } } int query (int a, int b, int cur = 1, int lt = 0, int rt = MAXN) { if (rt <= a || b <= lt) { return -1e9; } if (a <= lt && rt <= b) { return tr[cur]; } int mid = (lt + rt) / 2; return max(query(a, b, 2 * cur, lt, mid), query(a, b, 2 * cur + 1, mid, rt)); } }; int N, K; vector<pii> card; vector<int> T; vector<int> vals; segtree seg = segtree(); int main() { scanf("%d %d", &N, &K); card.resize(N); T.resize(K); for (int i = 0; i < N; i++) { scanf("%d %d", &card[i].fi, &card[i].se); vals.push_back(card[i].fi); vals.push_back(card[i].se); } for (int i = 0; i < K; i++) { scanf("%d", &T[i]); vals.push_back(T[i]); } sort(all(vals)); vals.resize(unique(all(vals)) - vals.begin()); for (int i = 0; i < N; i++) { card[i].fi = lower_bound(all(vals), card[i].fi) - vals.begin(); card[i].se = lower_bound(all(vals), card[i].se) - vals.begin(); T[i] = lower_bound(all(vals), T[i]) - vals.begin(); } vector<pii> vt; for (int i = 0; i < K; i++) { seg.update(T[i], i); vt.push_back({T[i], i}); } sort(all(vt)); sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); }); oset<int> certain; //ones that are certainly going to flip the card ll ans = 0; for (int i = 0; i < N; i++) { int mnside = min(card[i].fi, card[i].se), mxside = max(card[i].fi, card[i].se); while (!vt.empty() && vt.back().fi >= mxside) { certain.insert(vt.back().se); vt.pop_back(); } int x = seg.query(mnside, mxside); //KEY IDEA: "maybe" is going to turn the card to the min. so certainly the last "maybe" will. bool flip = (certain.size() - certain.order_of_key(x)) % 2; int ind; if (x == -1e9) { ind = (flip ? card[i].se : card[i].fi); } else { ind = (flip ? mnside : mxside); } ans += vals[ind]; } printf("%lld\n", ans); }

Compilation message (stderr)

fortune_telling2.cpp: In function 'int main()':
fortune_telling2.cpp:88:18: error: no match for 'operator+' (operand types are 'std::vector<std::pair<int, int> >' and 'int')
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
             ~~~~~^~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/stl_iterator.h:397:5: note: candidate: template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&)
     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:397:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/stl_iterator.h:1198:5: note: candidate: template<class _Iterator> std::move_iterator<_IteratorL> std::operator+(typename std::move_iterator<_IteratorL>::difference_type, const std::move_iterator<_IteratorL>&)
     operator+(typename move_iterator<_Iterator>::difference_type __n,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1198:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5876:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5876:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:53:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.tcc:1157:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.tcc:1157:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   mismatched types 'const _CharT*' and 'std::vector<std::pair<int, int> >'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:53:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.tcc:1173:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.tcc:1173:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'int'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5913:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5913:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5929:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5929:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5941:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5941:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5947:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5947:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5953:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5953:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5965:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5965:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   mismatched types 'const _CharT*' and 'std::vector<std::pair<int, int> >'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5971:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(_CharT __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5971:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'int'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5977:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _CharT*)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5977:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/bits/basic_string.h:5983:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, _CharT)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:5983:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/complex:326:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&, const std::complex<_Tp>&)
     operator+(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/7/complex:326:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'const std::complex<_Tp>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/complex:335:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&, const _Tp&)
     operator+(const complex<_Tp>& __x, const _Tp& __y)
     ^~~~~~~~
/usr/include/c++/7/complex:335:5: note:   template argument deduction/substitution failed:
fortune_telling2.cpp:88:20: note:   'std::vector<std::pair<int, int> >' is not derived from 'const std::complex<_Tp>'
  sort(card, card + N, [] (pii a, pii b) { return max(a.fi, a.se) > max(b.fi, b.se); });
                    ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fortune_telling2.cpp:1:
/usr/include/c++/7/c