Compilare: user.cpp: In function ‘int main()’: user.cpp:20:15: warning: unused variable ‘op’ [-Wunused-variable] int N,i,j,op,ok, Bi, Bj; ^ user.cpp:20:18: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int N,i,j,op,ok, Bi, Bj; ^ user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("3secv.in","r",stdin); ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("3secv.out","w",stdout); ^ user.cpp:23:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:26:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^ user.cpp:50:73: warning: ‘mn’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(j < N-1 && (q = newsol(sum(1,i), sum(i+1,j), sum(j+1,N))) && q < mn) ^