[Solved] Why is the output of these 2 programs different on codeforces while they are the same on ideone?

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In the first program you are setting the values of i and j outside the for loops and then only changing j inside the if statement in the outer for loop.

//...
if(i>j) 
{
    j=i; //<- set j here
    k=0;
    taken=0;
}

for(;j<n;++j) //<- using j from above
{
//...

In your second piece of code you are resetting j to zero each time the for loop is ran. You also never set j to a value before you enter the first for loop so when you use j in your if statement it will invoke undefined behavior.

//...
if(i>j) // j is uninitialized here so you could get anything
{
    j=i; //<- set j here
    k=0;
    taken=0;
}

for(j=0;j<n;++j) //<- set j to zero here
{
//...

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solved Why is the output of these 2 programs different on codeforces while they are the same on ideone?