求助，头文件出错？

[Error] 'sort' was not declared in this scope [Note] suggested alternative:

In file included from C:/Program Files/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-

from C:/Program Files/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.9.2/include/c++/x86_64-w64-mingw32/32/bits/stdc++.h

from C:\Documents and Settings\Administrator\桌面\rain编程\sgl.cpp

同一个文件夹的另一个cpp中也有algorithm头文件，执行正常。但是这个cpp会报错（如上）。万能头文件也没有用。