0_0_18027678_31450.cpp:85:3: error: stray '\' in program dfs(mm,(N-1)\num[x-mm]+1); ^ 0_0_18027678_31450.cpp: In function 'void dfs(int, LL)': 0_0_18027678_31450.cpp:85:16: error: expected ')' before 'num' dfs(mm,(N-1)\num[x-mm]+1); ^