View Compilation Error

0_0_32864085_14313.cpp: In function 'void dfs(int, int)':
0_0_32864085_14313.cpp:23:9: error: 'i' was not declared in this scope
     REP(i, n)if(!vis[i])
         ^
0_0_32864085_14313.cpp:23:13: error: 'REP' was not declared in this scope
     REP(i, n)if(!vis[i])
             ^
0_0_32864085_14313.cpp: In function 'int main()':
0_0_32864085_14313.cpp:37:8: error: 'i' was not declared in this scope
     FF(i, 1, 30)bin[i] = bin[i - 1] * 2;
        ^
0_0_32864085_14313.cpp:37:16: error: 'FF' was not declared in this scope
     FF(i, 1, 30)bin[i] = bin[i - 1] * 2;
                ^