/in/foo.cc:24:36: error: 'i' was not declared in this scope
 int n,k,l[N],r[N],c[N],ans[N],done[i];
                                    ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:31:13: error: 'done' was not declared in this scope
             done[i] = 1;
             ^~~~
/in/foo.cc:40:37: error: 'done' was not declared in this scope
                     if (!ans[j] && !done[j]) {
                                     ^~~~
/in/foo.cc:53:37: error: 'done' was not declared in this scope
                     if (!ans[j] && !done[j]) {
                                     ^~~~