foo.cc:5:20: error: conflicting declaration ‘int s [300005]’
    5 | int l,s,t,m,a[105],s[300005],f[3000005];
      |                    ^
foo.cc:5:7: note: previous declaration as ‘int s’
    5 | int l,s,t,m,a[105],s[300005],f[3000005];
      |       ^
foo.cc: In function ‘int main()’:
foo.cc:14:10: error: invalid types ‘int[int]’ for array subscript
   14 |         s[a[i]]=1;
      |          ^
foo.cc:20:55: error: invalid types ‘int[int]’ for array subscript
   20 |                                 f[i]=min(f[i],f[i-j]+s[i]);
      |                                                       ^