Compilare: main.cpp: In function 'int main()': main.cpp:48:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<lis.size();++i) ~^~~~~~~~~~~ main.cpp:48:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=0;i<lis.size();++i) ^~~ main.cpp:50:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~