View Compilation Error

0_0_32278439_27815.cpp:2:5: error: expected unqualified-id before 'for'
     for (long long i = 1; i*i <= n; i++) if (n % i == 0) { //这个地方可以优化，i*i<=n
     ^
0_0_32278439_27815.cpp:2:27: error: 'i' does not name a type
     for (long long i = 1; i*i <= n; i++) if (n % i == 0) { //这个地方可以优化，i*i<=n
                           ^
0_0_32278439_27815.cpp:2:37: error: 'i' does not name a type
     for (long long i = 1; i*i <= n; i++) if (n % i == 0) { //这个地方可以优化，i*i<=n
                                     ^