Increasing decreasing sequence

#1

#include
using namespace std;

int main()
{
int t;
cin>>t;
int prev,curr;
bool isvalid=true;
bool isdecreasing =true;

cin>>prev;
while(t--)
{
    cin>>curr;
    if(curr==prev)
    {
        isvalid=false;
        break;
    }
    
    else if(curr>prev)
    {
        isdecreasing =false;
    }
    
    else if(!isdecreasing && curr<prev)
    {
        isvalid=false;
        break;
    }
    prev=curr;
    
}
cout<<isvalid<<endl;

return 0;

}

PLEASE TELL ME THE PROBLEM IN THIS CODE…AS IT IS NOT SHOWING THE CORRECT OUTPUT.

#2

@dsdishu99
Two changes required :

  1. The output should be boolean instead of 0/1 . Use boolalpha to print bool output .
    cout<< boolalpha << isvalid<<endl;
  2. Your code is working for t inputs. However you have taken one of those inputs before you even began the while loop. Hence you loop should run for t-1 times instead of t times. Change your loop condition to
    while ( --t )
#3

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#4

source.cpp: In function ‘int main()’: source.cpp:26:36: error: lvalue required as left operand of assignment 26 | else if(n1>n2 and isdecreasing = false) | ^~~~~

#5

https://ide.codingblocks.com/s/403222 please help with the error