Compilare: user.cpp: In function ‘int med(int, int)’: user.cpp:57:9: warning: unused variable ‘l’ [-Wunused-variable] int l=-1000000000,r=1000000000,mid,i,j,k=0; ^ user.cpp:57:23: warning: unused variable ‘r’ [-Wunused-variable] int l=-1000000000,r=1000000000,mid,i,j,k=0; ^ user.cpp:57:36: warning: unused variable ‘mid’ [-Wunused-variable] int l=-1000000000,r=1000000000,mid,i,j,k=0; ^ user.cpp: In function ‘int main()’: user.cpp:79:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qvect.in","r",stdin); ^ user.cpp:80:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qvect.out","w",stdout); ^ user.cpp:81:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&Q); ^ user.cpp:85:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][0]); ^ user.cpp:87:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^ user.cpp:91:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&t,&x,&y); ^