Compilare: user.cpp: In function ‘void build_SA()’: user.cpp:28:26: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(i+(1<<loga-1)<n) ^ user.cpp:29:47: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] l[i].nr2=sa[loga-1][i+(1<<loga-1)]; ^ user.cpp: In function ‘int main()’: user.cpp:63:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.in","r",stdin); ^ user.cpp:64:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.out","w",stdout); ^ user.cpp:65:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(str); ^ /tmp/ccidHBqk.o: In function `main': user.cpp:(.text.startup+0x54): warning: the `gets' function is dangerous and should not be used.