View Compilation Error

0_0_38562970_25770.cpp: In function 'int main()':
0_0_38562970_25770.cpp:14:7: error: 'i' was not declared in this scope
   for(i=1;i<=n;i++)
       ^
0_0_38562970_25770.cpp:15:8: error: 'j' was not declared in this scope
   {for(j=1;j<=i;j++)
        ^
0_0_38562970_25770.cpp:19:7: error: 'i' was not declared in this scope
   for(i<=n-1;i>=1;i--)
       ^
0_0_38562970_25770.cpp:20:8: error: 'j' was not declared in this scope
   {for(j=0;j<=i;j++)
        ^