Compilare: main.cpp: In function 'int main()': main.cpp:59:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= strlen(a + 1); i++) ~~^~~~~~~~~~~~~~~~ main.cpp:52:31: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(A + 1, 10000000, fi); ^