View Compilation Error

0_0_17772443_30151.cpp: In function 'int main()':
0_0_17772443_30151.cpp:62:26: error: 'c' was not declared in this scope
    sum += node[m].c*node[c].t;     //表示经过父节点p后，需要经历node[p].t时间才到达m，所以讲m同p合并后，总代价要加上这段路径的代价；
                          ^