Compilare: main.cpp: In function 'void inse(std::string)': main.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp: In function 'void del(std::string)': main.cpp:41:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:53:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp: In function 'int cer2(std::string)': main.cpp:63:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp: In function 'int cer3(std::string)': main.cpp:75:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:77:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation] 77 | if(!a->ch[s[i]-'a'] || a->ch[s[i]-'a']->cnt==0) | ^~ main.cpp:79:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if' 79 | max1=i+1; | ^~~~