Compilare: user.cpp: In function ‘void buildrmq()’: user.cpp:13:44: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] rmq[i][j]=min(rmq[i][j-1],rmq[i+1<<(j-1)][j-1]); ^ user.cpp: In function ‘int query(int, int)’: user.cpp:17:39: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return min(rmq[a][lg[b-a+1]],rmq[b-1<<lg[b-a+1]][lg[b-a+1]]); ^ user.cpp: In function ‘int main()’: user.cpp:21:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.in","r",stdin); ^ user.cpp:22:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.out","w",stdout); ^