View Compilation Error

0_0_18077532_21483.cpp: In function 'int main()':
0_0_18077532_21483.cpp:107:5: error: 'charstr1' was not declared in this scope
     charstr1[Maxn*2],str2[Maxn*2];
     ^
0_0_18077532_21483.cpp:107:22: error: 'str2' was not declared in this scope
     charstr1[Maxn*2],str2[Maxn*2];
                      ^
0_0_18077532_21483.cpp:110:25: error: 'str1' was not declared in this scope
     while (scanf("%s%s",str1,str2)!=EOF)
                         ^