Compilare: user.cpp: In function ‘int main()’: user.cpp:18:13: warning: unused variable ‘inc’ [-Wunused-variable] int i,j,inc=1,sf=0,n,co,t; ^ user.cpp:18:19: warning: unused variable ‘sf’ [-Wunused-variable] int i,j,inc=1,sf=0,n,co,t; ^ user.cpp:16:36: 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:17:38: 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:19:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &n, &co); ^ user.cpp:25:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &j, &t); ^ user.cpp:28:64: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d %d", &intra.x, &intra.y, &iese.x, &iese.y); ^