View Compilation Error

0_0_37604032_22321.cpp: In function 'int func(int*, int)':
0_0_37604032_22321.cpp:34:43: error: 'upper_bound' was not declared in this scope
    j = upper_bound(s + 1,s + 1 + flag,b[i]) - s;
                                           ^
0_0_37604032_22321.cpp:34:43: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_37604032_22321.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:2111:5: note:   'std::upper_bound'
     upper_bound(_ForwardIterator __first, _ForwardIterator __last,
     ^