Compilare: main.cpp: In function 'int lca(int, int)': main.cpp:30:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses] int z=lsb(lvlx-lvly); ~~~~^~ main.cpp:2:17: note: in definition of macro 'lsb' #define lsb(i) (i&(-i)) ^ main.cpp: In function 'int main()': main.cpp:54:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lca.in","r",stdin); ^ main.cpp:55:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lca.out","w",stdout); ^ main.cpp:57:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&q); ^ main.cpp:61:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&anc[i][0]); ^ main.cpp:79:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^