maybe a floating point issue?

[Dennis]

On Friday, 19 September 2025 at 06:23:02 UTC, czylabsonasa wrote:
> I'm trying to solve a programming contest 
> [problem](https://open.kattis.com/problems/anthony) in D. The 
> almost identical solution in C++ got accepted, but I'm unable 
> to find the issue in the D code...

One difference between the C++ and D code is that your D code 
expects each line to end with a newline character:

```D
    for(i32 i=1;i<=A+C-1;i++){
       readf("%f\n",p[i]);
    }
```

So if your input file is this:

```
1 1
0.500000

```

Your C++ and D programs both output 0.500000. But if your input 
file lacks the final empty line:

```
1 1
0.500000
```

The C++ version still works, but D throws an exception:

```
std/format/spec.d(569): parseToFormatSpec: Cannot find character '
' in the input string.
```

Perhaps change the D code to this:

```D
    for(i32 i=1;i<=A+C-1;i++){
       p[i] = readln().to!float;
    }
```