Compilare: user.cpp: In function ‘int main()’: user.cpp:2:107: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;const int mod=666013;int v[2][5010],fact[5010];int main(){freopen("100m.in","r",stdin);freopen("100m.out","w",stdout);int n,sol=0;scanf("%d",&n);fact[0]=1;for(int i=1;i<=n;i++) {fact[i]=(1LL*fact[i-1]*i)%mod;}for(int i=1;i<=n;i++){v[1][1]=1;v[1][i]=fact[i];for(int j=2;j<i;j++){v[1][j]=(1LL*(v[0][j-1]+v[0][j])*j)%mod;}for(int j=1;j<=i;j++){v[0][j]=v[1][j];}}for(int i=1;i<=n;i++){sol=(sol+v[1][i])%mod;}printf("%d",sol);return 0;} ^ user.cpp:2:138: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;const int mod=666013;int v[2][5010],fact[5010];int main(){freopen("100m.in","r",stdin);freopen("100m.out","w",stdout);int n,sol=0;scanf("%d",&n);fact[0]=1;for(int i=1;i<=n;i++) {fact[i]=(1LL*fact[i-1]*i)%mod;}for(int i=1;i<=n;i++){v[1][1]=1;v[1][i]=fact[i];for(int j=2;j<i;j++){v[1][j]=(1LL*(v[0][j-1]+v[0][j])*j)%mod;}for(int j=1;j<=i;j++){v[0][j]=v[1][j];}}for(int i=1;i<=n;i++){sol=(sol+v[1][i])%mod;}printf("%d",sol);return 0;} ^ user.cpp:2:165: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;const int mod=666013;int v[2][5010],fact[5010];int main(){freopen("100m.in","r",stdin);freopen("100m.out","w",stdout);int n,sol=0;scanf("%d",&n);fact[0]=1;for(int i=1;i<=n;i++) {fact[i]=(1LL*fact[i-1]*i)%mod;}for(int i=1;i<=n;i++){v[1][1]=1;v[1][i]=fact[i];for(int j=2;j<i;j++){v[1][j]=(1LL*(v[0][j-1]+v[0][j])*j)%mod;}for(int j=1;j<=i;j++){v[0][j]=v[1][j];}}for(int i=1;i<=n;i++){sol=(sol+v[1][i])%mod;}printf("%d",sol);return 0;} ^