View Compilation Error

0_0_16987049_23672.cpp: In function 'int main()':
0_0_16987049_23672.cpp:42:42: error: 'k' was not declared in this scope
      bag_one[j]=min(bag_one[j],bag_one[j-k*stuff[i].v]+k);//付钱j时，付的最少个数
                                          ^
0_0_16987049_23672.cpp:47:16: error: 'sumj' was not declared in this scope
    for(int j=t+sumj>=stuff[i].v;j--){//这里是倒序正序都可以吗
                ^
0_0_16987049_23672.cpp:47:36: error: expected ';' before ')' token
    for(int j=t+sumj>=stuff[i].v;j--){//这里是倒序正序都可以吗
                                    ^