foo.cc: In function ‘int main()’:
foo.cc:22:20: warning: ‘now’ may be used uninitialized [-Wmaybe-uninitialized]
   22 |     cout<<dp[now][0]<<endl;
      |                    ^
foo.cc:11:13: note: ‘now’ was declared here
   11 |     int i,j,now,last;
      |             ^~~