Compilare: main.cpp: In function 'void addString(std::__cxx11::string&)': main.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:49:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=0; i<=K; i++) ^~~ main.cpp:51:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' add = 0; ^~~