Compilare: user.cpp: In function ‘int main()’: user.cpp:7:19: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] { int i,j,p,Max,a,nr; ^ user.cpp:8:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta5.in", "r", stdin); freopen("harta5.out","w", stdout); ^ user.cpp:8:72: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta5.in", "r", stdin); freopen("harta5.out","w", stdout); ^ user.cpp:9:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p); ^ user.cpp:10:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %hd %hd", &n, &m, &k); ^ user.cpp:12:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %hd %hd %hd",&C[i].x1,&C[i].y1,&C[i].x2,&C[i].y2); ^