Compilare: user.cpp: In function ‘int main()’: user.cpp:33:13: warning: unused variable ‘x’ [-Wunused-variable] int n,m,x,y,x1,x2,y1,y2,j=0,i=0; ^ user.cpp:33:15: warning: unused variable ‘y’ [-Wunused-variable] int n,m,x,y,x1,x2,y1,y2,j=0,i=0; ^ user.cpp:35:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.in","r",stdin); ^ user.cpp:36:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.out","w",stdout); ^ user.cpp:37:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:41:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:67:22: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] lee(x2,y2,v2,n,m); ^ user.cpp:66:22: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] lee(x1,y1,v1,n,m); ^