View Compilation Error

0_0_28084074_23292.cpp:7:1: error: 'll' does not name a type
 ll sum;
 ^
0_0_28084074_23292.cpp: In function 'void dfs(int)':
0_0_28084074_23292.cpp:47:13: error: 'sum' was not declared in this scope
             sum += val[e];
             ^
0_0_28084074_23292.cpp: In function 'int main()':
0_0_28084074_23292.cpp:81:9: error: 'll' was not declared in this scope
         ll ans = 0;
         ^
0_0_28084074_23292.cpp:82:9: error: 'sum' was not declared in this scope
         sum = 0;
         ^
0_0_28084074_23292.cpp:91:21: error: 'ans' was not declared in this scope
                     ans += sum;
                     ^
0_0_28084074_23292.cpp:94:25: error: 'ans' was not declared in this scope
         printf("%lld\n",ans);
                         ^