View Compilation Error

0_0_36840712_13104.cpp: In function 'int main()':
0_0_36840712_13104.cpp:47:9: error: 'l1' was not declared in this scope
      if(l1) e[a[i][j]][a[i][j-1]]=1;
         ^
0_0_36840712_13104.cpp:48:9: error: 'l2' was not declared in this scope
      if(l2) e[a[i][j]][a[i][j+1]]=1;
         ^
0_0_36840712_13104.cpp:49:9: error: 'l3' was not declared in this scope
      if(l3) e[a[i][j]][a[i-1][j]]=1;
         ^
0_0_36840712_13104.cpp:50:9: error: 'l4' was not declared in this scope
      if(l4) e[a[i][j]][a[i+1][j]]=1;
         ^