Compilare: user.cpp: In function ‘int main()’: user.cpp:8:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,q,n; ^ user.cpp:8:15: warning: unused variable ‘q’ [-Wunused-variable] int i,j,k,q,n; ^ user.cpp:9:36: warning: unused variable ‘p’ [-Wunused-variable] long long smax = -2000000000,s,p; ^ user.cpp:6:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diagonale.in","r",stdin); ^ user.cpp:7:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diagonale.out","w",stdout); ^ user.cpp:10:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:13:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^