Compilare: main.cpp: In function 'void dfs(int)': main.cpp:28:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[nod].size();j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void Prim()': main.cpp:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp:61:25: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(v[i][j].second.s[l]=='E') ^~ main.cpp:63:28: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if(Min2>nr3) ^~ main.cpp:78:25: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(v[i][j].second.s[l]=='E') ^~ main.cpp:80:28: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if(Min2>nr3) ^~ main.cpp:37:14: warning: unused variable 'o' [-Wunused-variable] int cost,o,p=1,c=0; viz[1]=1; int nr3=0; ^