View Compilation Error

0_0_20778190_18368.cpp: In function 'int main()':
0_0_20778190_18368.cpp:52:13: error: 'i' was not declared in this scope
         for(i = 1; i <= n; ++i) {
             ^
0_0_20778190_18368.cpp:54:17: error: 'j' was not declared in this scope
             for(j = 1; j <= n; ++j) {
                 ^
0_0_20778190_18368.cpp:56:23: error: 'k' was not declared in this scope
                   for(k=1;k<=n;++k)
                       ^