View Compilation Error

0_0_16836067_15536.cpp: In function 'void prework()':
0_0_16836067_15536.cpp:73:41: error: 'assert' was not declared in this scope
  rep(i,1,maxn)rep(j,1,maxn/i)assert(i&&j),ans[j*i]+=i*i*f[j],ans[j*i]-=i*i*f[j-1];
                                         ^