urgenta.cpp: In function 'void show()': urgenta.cpp:28: warning: comparison between signed and unsigned integer expressions urgenta.cpp: In function 'void kruskal()': urgenta.cpp:37: warning: comparison between signed and unsigned integer expressions urgenta.cpp: In function 'int main()': urgenta.cpp:62: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x urgenta.cpp:62: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x