Compilare: user.cpp: In function ‘int main()’: user.cpp:38:22: warning: unused variable ‘x1’ [-Wunused-variable] int i,j,N,t,o,nr,x1,y1,x2,y2,ii,jj; ^ user.cpp:38:25: warning: unused variable ‘y1’ [-Wunused-variable] int i,j,N,t,o,nr,x1,y1,x2,y2,ii,jj; ^ user.cpp:38:28: warning: unused variable ‘x2’ [-Wunused-variable] int i,j,N,t,o,nr,x1,y1,x2,y2,ii,jj; ^ user.cpp:38:31: warning: unused variable ‘y2’ [-Wunused-variable] int i,j,N,t,o,nr,x1,y1,x2,y2,ii,jj; ^ user.cpp:38:34: warning: unused variable ‘ii’ [-Wunused-variable] int i,j,N,t,o,nr,x1,y1,x2,y2,ii,jj; ^ user.cpp:38:37: warning: unused variable ‘jj’ [-Wunused-variable] int i,j,N,t,o,nr,x1,y1,x2,y2,ii,jj; ^ user.cpp:35:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.in","r",stdin); ^ user.cpp:36:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.out","w",stdout); ^ user.cpp:40:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:41:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&m,&p); ^ user.cpp:44:86: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &st_jos[i].x, &st_jos[i].y, &dr_sus[i].x, &dr_sus[i].y ); ^