Compilare: user.cpp: In function ‘void solve()’: user.cpp:30:32: warning: suggest parentheses around ‘-’ inside ‘>>’ [-Wparentheses] int left = (j + 1) >> 1 - 1; ^ user.cpp:29:17: warning: unused variable ‘from’ [-Wunused-variable] int from = i - j; ^ user.cpp: In function ‘int main()’: user.cpp:40:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &p, &N); ^