Compilare: user.cpp: In function ‘bool sorting(eu2, eu2)’: user.cpp:16:40: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a.dir==1&&(a.y1<b.y1||a.y1==b.y1&&a.x1<b.x1)) ^ user.cpp:18:40: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a.dir==1||(a.x1>b.x1||a.x1==b.x1&&a.y1>b.y1)) ^ user.cpp: In function ‘int main()’: user.cpp:24:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zc.in","r",stdin); ^ user.cpp:25:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zc.out","w",stdout); ^ user.cpp:26:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:29:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^ user.cpp:93:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n%c%d",&c,&dir); ^