gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:17:9: error: 'cn' was not declared in this scope
vec[cn--] = mx;
^
gap.cpp:23:38: error: 'max' was not declared in this scope
ans = max(ans, vec[i] - vec[i - 1]);
^
gap.cpp:23:38: note: suggested alternative:
In file included from /usr/include/c++/5/algorithm:62:0,
from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:64,
from gap.cpp:1:
/usr/include/c++/5/bits/stl_algo.h:3463:5: note: 'std::max'
max(initializer_list<_Tp> __l, _Compare __comp)
^
gap.cpp:12:7: warning: unused variable 'cnn' [-Wunused-variable]
int cnn = n - 1;
^