Compilare: user.cpp:8:27: warning: left shift count >= width of type [enabled by default] int v[MAX], arb[MAX * 2 + 2]; ^ user.cpp:5:15: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define MAX 1 << 18 ^ user.cpp:8:17: note: in expansion of macro ‘MAX’ int v[MAX], arb[MAX * 2 + 2]; ^ user.cpp: In function ‘int main()’: user.cpp:51:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &N, &M); ^ user.cpp:53:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^ user.cpp:59:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &op, &a, &b); ^