Compilare: user.cpp: In function ‘int dfs(int, int, int)’: user.cpp:60:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();++i){ ^ user.cpp:68:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int query(int, int)’: user.cpp:138:9: warning: unused variable ‘sum2’ [-Wunused-variable] int sum2=0; ^ user.cpp: In function ‘int main()’: user.cpp:151:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("disconnect.out","w",stdout); ^ user.cpp: In function ‘int getNumber()’: user.cpp:38:17: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] buffIt = 0; ^ user.cpp:45:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, BUFFER_SIZE, 1, inputFile); ^