Compilare: user.cpp: In function ‘int main()’: user.cpp:13:22: warning: unused variable ‘y2’ [-Wunused-variable] int n,cop,x,y,x1,y2,x2,y1,cnt,first=1,last=1,lin,col,j; ^ user.cpp:13:25: warning: unused variable ‘x2’ [-Wunused-variable] int n,cop,x,y,x1,y2,x2,y1,cnt,first=1,last=1,lin,col,j; ^ user.cpp:13:31: warning: unused variable ‘cnt’ [-Wunused-variable] int n,cop,x,y,x1,y2,x2,y1,cnt,first=1,last=1,lin,col,j; ^ user.cpp:13:58: warning: unused variable ‘j’ [-Wunused-variable] int n,cop,x,y,x1,y2,x2,y1,cnt,first=1,last=1,lin,col,j; ^ user.cpp:11:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.in", "r", stdin); ^ user.cpp:12:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.out", "w",stdout); ^ user.cpp:15:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &cop); ^ user.cpp:30:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp:34:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp:36:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x1, &y1); ^