Compilare: main.cpp: In function 'int main()': main.cpp:83:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s[i]) == lmax){ ~~~~~~~~~~~~~^~~~~~~ main.cpp:99:29: warning: NULL used in arithmetic [-Wpointer-arith] while(ans[j] != NULL){ ^~~~ main.cpp: In function 'void Read(int&)': main.cpp:49:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:54:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp: In function 'void R_Ch(char&)': main.cpp:21:38: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^