Eroare de compilare: main.cpp: In function 'int main()': main.cpp:33:32: error: invalid conversion from 'char' to 'const char*' [-fpermissive] 33 | strcat(str, b[first]); | ~~~~~~~^ | | | char In file included from /usr/include/c++/12.2.1/cstring:42, from main.cpp:2: /usr/include/string.h:149:70: note: initializing argument 2 of 'char* strcat(char*, const char*)' 149 | extern char *strcat (char *__restrict __dest, const char *__restrict __src) | ~~~~~~~~~~~~~~~~~~~~~~~^~~~~ main.cpp:34:27: error: 'second' was not declared in this scope 34 | strcat(str, b[second]); | ^~~~~~ main.cpp:24:13: warning: unused variable 'a_size' [-Wunused-variable] 24 | int a_size = strlen(a); | ^~~~~~ Non zero exit status: 1