0_0_32540103_11906.cpp: In function 'int main()': 0_0_32540103_11906.cpp:17:9: error: 'st' was not declared in this scope if (!st.empty()) { //Õ»²»¿Õ ^ 0_0_32540103_11906.cpp:36:10: error: 'st' was not declared in this scope while(!st.empty()){ ^