grafxy.cpp: In function 'void dijkstra()': grafxy.cpp:28: warning: comparison between signed and unsigned integer expressions grafxy.cpp:31: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x grafxy.cpp:31: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x grafxy.cpp: In function 'int main()': grafxy.cpp:58: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x grafxy.cpp:58: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x grafxy.cpp:64: warning: comparison between signed and unsigned integer expressions