Compilare: user.cpp: In function ‘int main()’: user.cpp:16:40: warning: unused variable ‘t’ [-Wunused-variable] int N,M,x,y,x1,y1,lensol=0,i,j,l,c,t; ^ user.cpp:17:11: warning: unused variable ‘w’ [-Wunused-variable] coord w; ^ user.cpp:18:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("memcpy.in","r",stdin); ^ user.cpp:19:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("memcpy.out","w",stdout); ^ user.cpp:20:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d", &N,&M,&x,&y,&x1,&y1); ^