Compilare: user.cpp: In function ‘unsigned int caut(unsigned int, unsigned int)’: user.cpp:25:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b>v[a][u]) ^ user.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[a][mij]>=b) ^ user.cpp:39:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[a][y]==b) ^ user.cpp: In function ‘int main()’: user.cpp:66:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] x=alf[s[i]]; ^ user.cpp:72:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] hsh[j]=(hsh[j]-(p[j-1]*alf[s[i-j]])%mod+mod)%mod; ^ user.cpp:46:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prefix2.in", "r", stdin); ^ user.cpp:47:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prefix2.out", "w", stdout); ^ user.cpp:48:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ user.cpp:57:17: warning: iteration 8u invokes undefined behavior [-Waggressive-loop-optimizations] alf[i]=x; ^ user.cpp:54:5: note: containing loop for(i='a';i<='z';i++) ^ /tmp/cclTHhpX.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.