Compilare: main.cpp: In function 'int main()': main.cpp:40:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[index].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:54:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=2;i<=n;i++) ^~~ main.cpp:59:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~