View Compilation Error

0_0_30145075_6497.cpp: In function 'void findd(int)':
0_0_30145075_6497.cpp:33:13: error: 'cun' was not declared in this scope
             cun+=pow(k*2,j);
             ^
0_0_30145075_6497.cpp:35:13: error: 'cun' was not declared in this scope
             cun+=k;
             ^
0_0_30145075_6497.cpp:41:13: error: 'cun' was not declared in this scope
             cun+=pow(k*2,j);
             ^
0_0_30145075_6497.cpp:43:17: error: 'cun' was not declared in this scope
                 cun+=k;
                 ^
0_0_30145075_6497.cpp:49:20: error: return-statement with a value, in function returning 'void' [-fpermissive]
     return val[root];
                    ^