View Compilation Error

0_0_25118087_8514.cpp: In function 'void addedge(int, int, int)':
0_0_25118087_8514.cpp:24:30: error: 'dos' was not declared in this scope
 "~/Desktop/cpp/hdu3586.cpp" [dos] 76L, 1504C                                   
                              ^
0_0_25118087_8514.cpp:24:40: error: expected '}' at end of input
 "~/Desktop/cpp/hdu3586.cpp" [dos] 76L, 1504C                                   
                                        ^