View Compilation Error

0_0_25693056_11247.cpp: In function 'long long int dij()':
0_0_25693056_11247.cpp:78:24: error: expected ':' before ';' token
  return dis[n]==inf?inf;log2(dis[n]);
                        ^
0_0_25693056_11247.cpp:78:24: error: expected primary-expression before ';' token