View Compilation Error

0_0_32853951_27241.cpp: In function 'int main()':
0_0_32853951_27241.cpp:18:8: error: 'j' was not declared in this scope
    for(j=0;j<n;j++)
        ^
0_0_32853951_27241.cpp:41:8: error: 'j' was not declared in this scope
    for(j=n-2;j>=0;j--)
        ^
0_0_32853951_27241.cpp:50:8: error: 'j' was not declared in this scope
    for(j=0;j<n;j++)
        ^