View Compilation Error

0_0_17747063_14523.cpp: In function 'int main()':
0_0_17747063_14523.cpp:49:17: error: 'f' was not declared in this scope
                 f[(x^(1<<k))^(1<<(j+1))]=1;
                 ^
0_0_17747063_14523.cpp:49:20: error: 'x' was not declared in this scope
                 f[(x^(1<<k))^(1<<(j+1))]=1;
                    ^
0_0_17747063_14523.cpp:53:9: error: 'sum' was not declared in this scope
         sum = 0;
         ^
0_0_17747063_14523.cpp:56:16: error: 'm' was not declared in this scope
             if(m!=0)
                ^
0_0_17747063_14523.cpp:57:29: error: 's' was not declared in this scope
                 sum= sum^dp[s];
                             ^
0_0_17747063_14523.cpp:59:12: error: 'flag2' was not declared in this scope
         if(flag2==0)
            ^