Compilare: main.cpp: In function 'int main()': main.cpp:45:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[index].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:62:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=2;i<=n;i++) ^~~ main.cpp:67:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~ main.cpp:18:18: warning: unused variable 'k' [-Wunused-variable] int i,n,m,x,y,z,k,index,min,vecin,cost; ^ main.cpp:18:26: warning: unused variable 'min' [-Wunused-variable] int i,n,m,x,y,z,k,index,min,vecin,cost; ^~~