Why i am getting wrong answer in increasing decreasing sequence

#1

#include
using namespace std;

bool increasingDecreasing(int n)
{
int prev;
cin >> prev;

bool isValid = true;
bool isDecreasing = true;

while (--n)
{
    int curr;
    cin >> curr;
    if (curr == prev)
    {
        isValid = false;
        break;
    }
    else if (curr > prev)
    {
        isDecreasing = false;
    }
    else if (isDecreasing!=false && curr < prev)
    {
        isValid = false;
        break;
    }

    prev = curr;
}

return isValid;

}

int main()
{
int n;
cin>>n;
if(increasingDecreasing(n))
{
cout<<“true”;
}
else
{
cout<<“false”;
}
return 0;
}

#2

Hi @sroy3166,
first, since u r breaking ur while loop in between , u r ignoring someinputs which are being given by the grader.
so add
if(n>0){
while(–n){
int curr;
cin >> curr;
}
}
after the present while loop in ur code function.
2) ur code outputs true when input = {1,2,3,2,1}. whereas output should be false.
try modifying ur code.
Hope dis helps.
If u still have any doubts or feel like something is unclear, feel free to post ur doubts here.

#3

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