Compilare: main.cpp: In function 'int main()': main.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ~^~~~~~~~~ main.cpp:53:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ~^~~~~~~~~ main.cpp:53:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=0;i<b.size();i++) ^~~ main.cpp:56:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~