Compilare: main.cpp: In function 'int main()': main.cpp:22:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<concat.length();i++) ~^~~~~~~~~~~~~~~~ main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r<concat.length() && concat[r]==concat[r-l]) ~^~~~~~~~~~~~~~~~ main.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r<concat.length() && concat[r]==concat[r-l]) ~^~~~~~~~~~~~~~~~ main.cpp:61:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(auto it:poz) ^~~ main.cpp:62:22: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' t2<<it<<' '; t2<<'\n'; ^~