sorting.cpp: In function 'void solve(VI&)':
sorting.cpp:92:4: error: reference to 'prev' is ambiguous
prev[i][h] = h;
^~~~
sorting.cpp:61:24: note: candidates are: int prev [1025][1025]
int dp[MAXN+1][MAXN+1],prev[MAXN+1][MAXN+1];
^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
from /usr/include/c++/7/algorithm:61,
from sorting.cpp:7:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:220:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
prev(_BidirectionalIterator __x, typename
^~~~
sorting.cpp:102:5: error: reference to 'prev' is ambiguous
prev[i][pos[i]] = k;
^~~~
sorting.cpp:61:24: note: candidates are: int prev [1025][1025]
int dp[MAXN+1][MAXN+1],prev[MAXN+1][MAXN+1];
^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
from /usr/include/c++/7/algorithm:61,
from sorting.cpp:7:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:220:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
prev(_BidirectionalIterator __x, typename
^~~~
sorting.cpp:124:9: error: reference to 'prev' is ambiguous
ind = prev[i][ind];
^~~~
sorting.cpp:61:24: note: candidates are: int prev [1025][1025]
int dp[MAXN+1][MAXN+1],prev[MAXN+1][MAXN+1];
^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
from /usr/include/c++/7/algorithm:61,
from sorting.cpp:7:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:220:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
prev(_BidirectionalIterator __x, typename
^~~~
sorting.cpp: In function 'int main()':
sorting.cpp:137:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
sorting.cpp:142:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&val);
~~~~~^~~~~~~~~~~