Compilare: main.cpp: In function 'int main()': main.cpp:13:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i=0;i<cuv.size();i++) | ~^~~~~~~~~~~ main.cpp:21:17: warning: this 'if' clause does not guard... [-Wmisleading-indentation] 21 | if(ok==0) | ^~ main.cpp:22:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if' 22 | nr=1;i++; | ^