Compilare: main.cpp: In function 'void apm(int)': main.cpp:78:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:115:11: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int j=0;j<i;j++) ^~~ main.cpp:119:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fo<<fixed<<setprecision(6)<<s<<endl; ^~