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View Compilation Error

0_0_38500370_23026.cpp: In function 'void solve()':
0_0_38500370_23026.cpp:23:16: error: expected unqualified-id before '[' token
     for (auto &[a, b]: w) cin >> a >> b, st.insert(b);
                ^
0_0_38500370_23026.cpp:23:16: error: expected ';' before '[' token
0_0_38500370_23026.cpp:23:17: error: 'a' was not declared in this scope
     for (auto &[a, b]: w) cin >> a >> b, st.insert(b);
                 ^
0_0_38500370_23026.cpp:23:20: error: 'b' was not declared in this scope
     for (auto &[a, b]: w) cin >> a >> b, st.insert(b);
                    ^
0_0_38500370_23026.cpp: In lambda function:
0_0_38500370_23026.cpp:23:22: error: expected '{' before ':' token
     for (auto &[a, b]: w) cin >> a >> b, st.insert(b);
                      ^
0_0_38500370_23026.cpp: In function 'void solve()':
0_0_38500370_23026.cpp:23:22: error: expected ';' before ':' token
0_0_38500370_23026.cpp:23:22: error: expected primary-expression before ':' token
0_0_38500370_23026.cpp:23:22: error: expected ')' before ':' token
0_0_38500370_23026.cpp:23:22: error: expected primary-expression before ':' token
0_0_38500370_23026.cpp:30:14: error: expected unqualified-id before '[' token
         auto [a, b] = w[i];
              ^
0_0_38500370_23026.cpp:31:26: error: 'b' was not declared in this scope
         st.erase(st.find(b));
                          ^
0_0_38500370_23026.cpp:32:29: error: 'a' was not declared in this scope
         ans = min({ans, abs(a - max(*st.lower_bound(a), maxv)), abs(a - max(*prev(st.upper_bound(a)), maxv))});
                             ^
0_0_38500370_23026.cpp:32:110: error: no matching function for call to 'min(<brace-enclosed initializer list>)'
         ans = min({ans, abs(a - max(*st.lower_bound(a), maxv)), abs(a - max(*prev(st.upper_bound(a)), maxv))});
                                                                                                              ^
0_0_38500370_23026.cpp:32:110: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_38500370_23026.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:194:5: note: template<class _Tp> const _Tp& std::min(const _Tp&, const _Tp&)
     min(const _Tp& __a, const _Tp& __b)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:194:5: note:   template argument deduction/substitution failed:
0_0_38500370_23026.cpp:32:110: note:   candidate expects 2 arguments, 1 provided
         ans = min({ans, abs(a - max(*st.lower_bound(a), maxv)), abs(a - max(*prev(st.upper_bound(a)), maxv))});
                                                                                                              ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_38500370_23026.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:240:5: note: template<class _Tp, class _Compare> const _Tp& std::min(const _Tp&, const _Tp&, _Compare)
     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:240:5: note:   template argument deduction/substitution failed:
0_0_38500370_23026.cpp:32:110: note:   candidate expects 3 arguments, 1 provided
         ans = min({ans, abs(a - max(*st.lower_bound(a), maxv)), abs(a - max(*prev(st.upper_bound(a)), maxv))});
                                                                                                              ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_38500370_23026.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3439:5: note: template<class _Tp> _Tp std::min(std::initializer_list<_Tp>)
     min(initializer_list<_Tp> __l)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3439:5: note:   template argument deduction/substitution failed:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3444:5: note: template<class _Tp, class _Compare> _Tp std::min(std::initializer_list<_Tp>, _Compare)
     min(initializer_list<_Tp> __l, _Compare __comp)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3444:5: note:   template argument deduction/substitution failed:


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