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stack<int> stack;
for (int i = 0 ; i < N; ++i) {
int currentElement = A[i];
 
   // skip current iteration if currentElement is not less than 0
while (!stack.empty() && stack.top() < currentElement) {
 
     answer = minimum(answer, stack.top() * currentElement);
stack.pop();
}
stack.push(currentElement);
}
 

prog.cpp:2:1: error: ‘stack’ does not name a type
 stack<int> stack;
 ^~~~~
prog.cpp:3:1: error: expected unqualified-id before ‘for’
 for (int i = 0 ; i < N; ++i) {
 ^~~
prog.cpp:3:18: error: ‘i’ does not name a type
 for (int i = 0 ; i < N; ++i) {
                  ^
prog.cpp:3:25: error: expected unqualified-id before ‘++’ token
 for (int i = 0 ; i < N; ++i) {
                         ^~

Standard output is empty