本人蒟蒻，想问下考场上能怎么写吗？

void add_edge(int u,int v,int num){
	++cnt;
	e[cnt] = {u,v,num,head[u]};
	head[u] = cnt;
	e2[cnt] = {num,cnt};
}

报错:

20	27	C:\Users\Administrator\Desktop\kruskal.cpp	[Warning] extended initializer lists only available with -std=c++11 or -std=gnu++11
20	9	C:\Users\Administrator\Desktop\kruskal.cpp	[Warning] extended initializer lists only available with -std=c++11 or -std=gnu++11

等等