/in/foo.cc: In function 'int main()':
/in/foo.cc:56:7: error: 'pre' was not declared in this scope
       pre[newnum] = now;
       ^~~
/in/foo.cc:73:7: error: 'pre' was not declared in this scope
       pre[newnum] = now;
       ^~~
/in/foo.cc:90:7: error: 'pre' was not declared in this scope
       pre[newnum] = now;
       ^~~
/in/foo.cc:107:7: error: 'pre' was not declared in this scope
       pre[newnum] = now;
       ^~~