Compilare: user.cpp: In function ‘int main()’: user.cpp:45:23: warning: left operand of comma operator has no effect [-Wunused-value] x,y; ^ user.cpp:45:24: warning: right operand of comma operator has no effect [-Wunused-value] x,y; ^ user.cpp:37:11: warning: unused variable ‘nx’ [-Wunused-variable] int k,nx,ny,x,y; ^ user.cpp:37:14: warning: unused variable ‘ny’ [-Wunused-variable] int k,nx,ny,x,y; ^ user.cpp:19:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sahara.in", "r", stdin); ^ user.cpp:20:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sahara.out", "w", stdout); ^ user.cpp:22:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&q); ^ user.cpp:23:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:25:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d",&x1,&y1,&x2,&y2,&v); ^