Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:29:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int index = 0; index < strlen(buffer1); index++) { ^ user.cpp:30:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] solution1[buffer1[index]] += 1; ^ user.cpp:54:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int index = 0; index < strlen(buffer1); index++) { ^ user.cpp:55:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] solution1[buffer1[index]] += 1; ^ user.cpp:58:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int index = 0; index < strlen(buffer2); index++) { ^ user.cpp:59:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] solution2[buffer2[index]] += 1; ^