0_0_30051233_21856.cpp:12:1: error: 'stack' does not name a type
stack<int>st;
^
0_0_30051233_21856.cpp: In function 'int main()':
0_0_30051233_21856.cpp:30:13: error: 'st' was not declared in this scope
st.push(index);
^
0_0_30051233_21856.cpp:57:19: error: 'st' was not declared in this scope
lst = st.top();
^
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