Compilare: main.cpp: In function 'int main()': main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[start].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:63:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[start].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:75:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[k].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void dijkstra()': main.cpp:91:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void dijkstra2()': main.cpp:115:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[x].size();i++) ~^~~~~~~~~~~~