View Compilation Error

0_0_28894463_25217.cpp: In function 'int main()':
0_0_28894463_25217.cpp:55:20: error: 'i' was not declared in this scope
             s[a].x=i;
                    ^
0_0_28894463_25217.cpp:56:20: error: 'j' was not declared in this scope
             s[a].y=j;
                    ^