View Compilation Error

0_0_26404736_23082.cpp: In function 'bool join(int, int)':
0_0_26404736_23082.cpp:32:20: error: 'find' was not declared in this scope
     int fl = find(l);
                    ^
0_0_26404736_23082.cpp:32:20: note: suggested alternative:
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_26404736_23082.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3770:5: note:   'std::find'
     find(_InputIterator __first, _InputIterator __last,
     ^