Compilare: user.cpp: In function ‘int main()’: user.cpp:33:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,j,k,i1,i2,j1,j2,l=0; ^ user.cpp:33:19: warning: unused variable ‘i1’ [-Wunused-variable] int n,m,i,j,k,i1,i2,j1,j2,l=0; ^ user.cpp:33:22: warning: unused variable ‘i2’ [-Wunused-variable] int n,m,i,j,k,i1,i2,j1,j2,l=0; ^ user.cpp:33:25: warning: unused variable ‘j1’ [-Wunused-variable] int n,m,i,j,k,i1,i2,j1,j2,l=0; ^ user.cpp:33:28: warning: unused variable ‘j2’ [-Wunused-variable] int n,m,i,j,k,i1,i2,j1,j2,l=0; ^ user.cpp:35:43: 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:36:45: 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:37:25: 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:40:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&v[1+l].x,&v[l+1].y,&v[l+2].x,&v[l+2].y); ^