Compilare: user.cpp: In function ‘int main()’: user.cpp:80:26: warning: unused variable ‘p’ [-Wunused-variable] int n, i, j, p, r, k; ^ user.cpp:80:29: warning: unused variable ‘r’ [-Wunused-variable] int n, i, j, p, r, k; ^ user.cpp:80:32: warning: unused variable ‘k’ [-Wunused-variable] int n, i, j, p, r, k; ^ user.cpp:81:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in","r",stdin); ^ user.cpp:82:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out","w",stdout); ^ user.cpp:83:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:86:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^