0_0_14172409_20305.cpp:7:1: error: 'num' does not name a type num[1] = 1; ^ 0_0_14172409_20305.cpp: In function 'void dfs(int)': 0_0_14172409_20305.cpp:31:32: error: 'prime' cannot be used as a function if(prime(num[n-1]+i)) ^