View Compilation Error

0_0_34957331_30726.cpp: In function 'int main()':
0_0_34957331_30726.cpp:21:7: error: expected ',' or ';' before 'for'
       for (int j = 0; j < n; j++) {
       ^
0_0_34957331_30726.cpp:21:23: error: 'j' was not declared in this scope
       for (int j = 0; j < n; j++) {
                       ^