Compilare: user.cpp: In function ‘int cmmdc(int, int)’: user.cpp:12:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(r=a%b){ ^ user.cpp: In function ‘int main()’: user.cpp:26:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( IN ,"r" , stdin); ^ user.cpp:27:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( OUT ,"w" ,stdout); ^ user.cpp:28:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:31:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&q[i].x,&q[i].y,&q[i].d); ^