View Compilation Error

0_0_16651453_18384.cpp: In function 'int main()':
0_0_16651453_18384.cpp:26:13: error: 'z' was not declared in this scope
             z[i][0]=0;
             ^
0_0_16651453_18384.cpp:30:13: error: 'z' was not declared in this scope
             z[0][i]=0;
             ^
0_0_16651453_18384.cpp:38:21: error: 'z' was not declared in this scope
                     z[i][j]=z[i-1][j-1]+w[x[i-1]];
                     ^
0_0_16651453_18384.cpp:42:21: error: 'z' was not declared in this scope
                     z[i][j]=max(z[i-1][j],z[i][j-1]);
                     ^
0_0_16651453_18384.cpp:46:23: error: 'z' was not declared in this scope
         printf("%d\n",z[m][n]);
                       ^