/in/foo.cc: In function 'long long unsigned int chk(long long unsigned int, long long unsigned int, long long unsigned int)':
/in/foo.cc:26:102: error: expected primary-expression before '/' token
     int ans1=a[x][y]-a[x-len][y]*fac2[len]-a[x][y-len]*fac1[len]+a[x-len][y-len]*fac1[len]*fac2[len];/
                                                                                                      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:101:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
                     if(mid)sum=mid;l=mid+1;
                     ^~
/in/foo.cc:101:36: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
                     if(mid)sum=mid;l=mid+1;
                                    ^
/in/foo.cc:117:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
                     if(mid)sum=mid;l=mid+1;
                     ^~
/in/foo.cc:117:36: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
                     if(mid)sum=mid;l=mid+1;
                                    ^