Compilare: main.cpp: In function 'int main()': main.cpp:70:20: warning: narrowing conversion of 'b' from 'int' to 'double' inside { } [-Wnarrowing] vf[i]= {a,b}; ^ main.cpp:72:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1; i<n; ++i) ^~~ main.cpp:80:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(int j=0; j!=v[1].size(); ++j) ^~~ main.cpp:80:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j!=v[1].size(); ++j) ~^~~~~~~~~~~~~ main.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j!=v[i].size(); ++j) ~^~~~~~~~~~~~~ main.cpp:91:17: warning: unused variable 'cval' [-Wunused-variable] int cval=val; ^~~~