Compilare: user.cpp: In function ‘int LCP(int, int)’: user.cpp:30:26: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] if (Part[x] != Part[x + 1 << k] || Part[y] != Part[y + 1 << k]) return ret; ^ user.cpp:30:57: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] if (Part[x] != Part[x + 1 << k] || Part[y] != Part[y + 1 << k]) return ret; ^ user.cpp: In function ‘int main()’: user.cpp:42:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &M); ^ user.cpp:46:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(A + pos); ^ In file included from /usr/include/stdio.h:934:0, from user.cpp:2: In function ‘char* gets(char*)’, inlined from ‘int main()’ at user.cpp:46:16: /usr/include/i386-linux-gnu/bits/stdio2.h:230:28: warning: call to ‘__gets_warn’ declared with attribute warning: please use fgets or getline instead, gets can't specify buffer size [enabled by default] return __gets_warn (__str); ^ /tmp/ccmu1IIj.o: In function `main': user.cpp:(.text.startup+0x8c): warning: the `gets' function is dangerous and should not be used.