Compilare: user.cpp: In function ‘int Find(int)’: user.cpp:61:73: warning: left operand of comma operator has no effect [-Wunused-value] val1_3 = F( (hash_1[pos + 3 * i - 1] - (hash_1[pos + 2 * i - 1] * prec_1[i], MOD_1)), MOD_1); ^ user.cpp:62:61: warning: left operand of comma operator has no effect [-Wunused-value] val2_1 = F( (hash_2[pos + i - 1] - (hash_2[pos - 1] * prec_2[i], MOD_2)), MOD_2); ^ user.cpp:63:70: warning: left operand of comma operator has no effect [-Wunused-value] val2_2 = F( (hash_2[pos + 2 * i - 1] - (hash_2[pos + i - 1] * prec_2[i], MOD_2)), MOD_2); ^ user.cpp:64:73: warning: left operand of comma operator has no effect [-Wunused-value] val2_3 = F( (hash_2[pos + 3 * i - 1] - (hash_2[pos + 2 * i - 1] * prec_2[i], MOD_2)), MOD_2); ^ user.cpp: In function ‘int main()’: user.cpp:74:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S); ^ /tmp/ccbvPFjq.o: In function `main': user.cpp:(.text.startup+0x1c): warning: the `gets' function is dangerous and should not be used.