Compilare: user.cpp: In function ‘int main()’: user.cpp:2:89: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int a[100001],n,k,smax,s,i;int main(){freopen("perle2.in","r",stdin);freopen("perle2.out","w",stdout);scanf("%d%d",&n,&k);for(i=0;i<n;++i)scanf("%d",&a[i]);smax=s=a[0]-k;for(i=1;i<n;++i){if(s>0)s+=a[i]-k;else s=a[i]-k;if(smax<s)smax=s;}printf("%d",smax);} ^ user.cpp:2:122: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int a[100001],n,k,smax,s,i;int main(){freopen("perle2.in","r",stdin);freopen("perle2.out","w",stdout);scanf("%d%d",&n,&k);for(i=0;i<n;++i)scanf("%d",&a[i]);smax=s=a[0]-k;for(i=1;i<n;++i){if(s>0)s+=a[i]-k;else s=a[i]-k;if(smax<s)smax=s;}printf("%d",smax);} ^ user.cpp:2:142: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int a[100001],n,k,smax,s,i;int main(){freopen("perle2.in","r",stdin);freopen("perle2.out","w",stdout);scanf("%d%d",&n,&k);for(i=0;i<n;++i)scanf("%d",&a[i]);smax=s=a[0]-k;for(i=1;i<n;++i){if(s>0)s+=a[i]-k;else s=a[i]-k;if(smax<s)smax=s;}printf("%d",smax);} ^ user.cpp:2:176: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int a[100001],n,k,smax,s,i;int main(){freopen("perle2.in","r",stdin);freopen("perle2.out","w",stdout);scanf("%d%d",&n,&k);for(i=0;i<n;++i)scanf("%d",&a[i]);smax=s=a[0]-k;for(i=1;i<n;++i){if(s>0)s+=a[i]-k;else s=a[i]-k;if(smax<s)smax=s;}printf("%d",smax);} ^