Update

main.py

@@ -15,7 +15,7 @@ class ComputeInput(BaseModel):
 
 def run_compute(a,b,sigma):
     result = subprocess.run(
-        ['./computeC', str(a), str(b), sigma],
+        ['./computeC', a, b, sigma],
         capture_output=True,
         text=True
     )
@@ -25,7 +25,7 @@ def run_compute(a,b,sigma):
 async def compute(data: ComputeInput):
     a_start = int(data.a)
     b_end = int(data.b)
-    sigma = data.sigma
+    sigma = int(data.sigma)
 
     num_chunks = 16