Compilare: main.cpp: In function 'int main()': main.cpp:67:17: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[30]' [-Wformat=] 67 | scanf("%s", &s); | ~^ ~~ | | | | | char (*)[30] | char* In file included from /usr/include/c++/10/cassert:44, from main.cpp:4: main.cpp:68:26: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 68 | assert(strlen(s) == k); | ~~~~~~~~~~^~~~ main.cpp:91:17: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[30]' [-Wformat=] 91 | scanf("%s", &s); | ~^ ~~ | | | | | char (*)[30] | char* In file included from /usr/include/c++/10/cassert:44, from main.cpp:4: main.cpp:92:26: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 92 | assert(strlen(s) == k); | ~~~~~~~~~~^~~~