graf.cpp: In function 'bool make_dist(int, std::vector<int, std::allocator<int> >&)': graf.cpp:29: warning: comparison between signed and unsigned integer expressions graf.cpp: In function 'int main()': graf.cpp:65: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x graf.cpp:73: warning: comparison between signed and unsigned integer expressions graf.cpp:80: warning: comparison between signed and unsigned integer expressions