View Compilation Error

0_0_20397904_23440.cpp:4:9: error: expected unqualified-id before 'for'
         for (int j = 0; j < n; ++j) {
         ^
0_0_20397904_23440.cpp:4:25: error: 'j' does not name a type
         for (int j = 0; j < n; ++j) {
                         ^
0_0_20397904_23440.cpp:4:32: error: expected unqualified-id before '++' token
         for (int j = 0; j < n; ++j) {
                                ^