Compilare: user.cpp: In member function ‘Hg Hg::operator+=(const Hg&)’: user.cpp:13:137: warning: no return statement in function returning non-void [-Wreturn-type] Hg Hg::operator +=(const Hg&m){int i,t;x[0]=max(x[0],m.x[0]);for(t=0,i=1;i<=x[0];i++){t=x[i]+m.x[i]+t;x[i]=t%mb;t/=mb;}if(t)x[++x[0]]=t;} ^ user.cpp: In function ‘int main()’: user.cpp:15:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] int main(){freopen("perm6.in","r",stdin);freopen("perm6.out","w",stdout);int n,k,i,j;scanf("%d%d",&n,&k);for(i=1;i<=n;i++)dp[i][0]=1;for(i=2;i<=n;i++){for(j=k;j>=1;j--){for(int t=j;t>=j-i+1;t--)dp[i][j]+=dp[i-1][t];}}dp[n][k].print();} ^ user.cpp:15:73: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] int main(){freopen("perm6.in","r",stdin);freopen("perm6.out","w",stdout);int n,k,i,j;scanf("%d%d",&n,&k);for(i=1;i<=n;i++)dp[i][0]=1;for(i=2;i<=n;i++){for(j=k;j>=1;j--){for(int t=j;t>=j-i+1;t--)dp[i][j]+=dp[i-1][t];}}dp[n][k].print();} ^ user.cpp:15:105: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int main(){freopen("perm6.in","r",stdin);freopen("perm6.out","w",stdout);int n,k,i,j;scanf("%d%d",&n,&k);for(i=1;i<=n;i++)dp[i][0]=1;for(i=2;i<=n;i++){for(j=k;j>=1;j--){for(int t=j;t>=j-i+1;t--)dp[i][j]+=dp[i-1][t];}}dp[n][k].print();} ^