Compilare: main.c: In function 'main': main.c:87:54: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] seg[i][j] = cmp(seg[i-1][j], seg[i-1][j + (1<<i-1)]); ~^~ main.c:56:3: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("lca.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:57:3: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("lca.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:60:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &q); ^~~~~~~~~~~~~~~~~~~~~ main.c:62:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &j); ^~~~~~~~~~~~~~~ main.c:91:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~