0_0_30696837_18075.cpp: In function 'void tarjan(int)': 0_0_30696837_18075.cpp:38:13: error: 'x' was not declared in this scope x = s.top(); ^ 0_0_30696837_18075.cpp:41:16: error: 'x' was not declared in this scope }while(x!=node); ^