Compilare: user.cpp: In function ‘int main()’: user.cpp:9:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,j,k,i1,i2,j1,j2,sol,val; ^ user.cpp:9:35: warning: unused variable ‘val’ [-Wunused-variable] int n,m,i,j,k,i1,i2,j1,j2,sol,val; ^ user.cpp:10:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri4.in","r",stdin); ^ user.cpp:11:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri4.out","w",stdout); ^ user.cpp:12:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); sol=0; ^ user.cpp:15:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&j1,&i1,&j2,&i2); ^