Compilare: user.cpp: In function ‘int main()’: user.cpp:41:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:41:21: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:41:24: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:41:30: warning: unused variable ‘x’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:41:33: warning: unused variable ‘y’ [-Wunused-variable] int n, i, j, s, t, d, k, x, y; ^ user.cpp:38:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reactivi.in","r",stdin); ^ user.cpp:39:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reactivi.out","w",stdout); ^ user.cpp:43:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:45:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^