Compilare: user.cpp: In function ‘int main()’: user.cpp:58:9: warning: unused variable ‘x’ [-Wunused-variable] int x,y,m,p,i1,j1,i,j; ^ user.cpp:58:11: warning: unused variable ‘y’ [-Wunused-variable] int x,y,m,p,i1,j1,i,j; ^ user.cpp:58:17: warning: unused variable ‘i1’ [-Wunused-variable] int x,y,m,p,i1,j1,i,j; ^ user.cpp:58:20: warning: unused variable ‘j1’ [-Wunused-variable] int x,y,m,p,i1,j1,i,j; ^ user.cpp:86:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok; ^ user.cpp:56:34: 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:57:36: 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:59:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:60:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&m,&p); ^ user.cpp:63:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&dr[i].x1,&dr[i].y1,&dr[i].x2,&dr[i].y2); ^