Flowchart the opencl code

#define _CRT_SECURE_NO_WARNINGS
#define CL_USE_DEPRECATED_OPENCL_1_2_APIS
#include <CL/cl.h>
#include <CL/cl_platform.h>
#include <iostream>
#include <cstdlib>
#include <stdio.h>
 
#define MAX_SOURCE_SIZE (0x100000)
#define LIST_SIZE 128
 
int main(void) {
   int* A = new int[LIST_SIZE];
   int* C = new int[LIST_SIZE];
   int* B = new int[LIST_SIZE];
   srand(time(0));
   for (int i = 0; i < LIST_SIZE; i++) {
       A[i] = (rand() % 200) / 2.;
       C[i] = (rand() % 200) / 2.;
   }
 
   FILE* fp;
   char* source_str;
   size_t source_size;
 
   fp = fopen("kernel.cl", "r");
   if (!fp) {
       fprintf(stderr, "Failed to load kernel.\n");
       exit(1);
   }
   source_str = new char[MAX_SOURCE_SIZE];
   source_size = fread(source_str, 1, MAX_SOURCE_SIZE, fp);
   fclose(fp);
 
   cl_platform_id platform_id = NULL;
   cl_device_id device_id = NULL;
   cl_uint ret_num_devices;
   cl_uint ret_num_platforms;
   cl_int ret = clGetPlatformIDs(1, &platform_id, &ret_num_platforms);
   ret = clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_DEFAULT, 1, &device_id, &ret_num_devices);
 
   
   cl_context context = clCreateContext(NULL, 1, &device_id, NULL, NULL, &ret);
 
  
   cl_command_queue command_queue = clCreateCommandQueueWithProperties(context, device_id, 0, &ret);

   cl_mem a_mem_obj = clCreateBuffer(context, CL_MEM_READ_ONLY, LIST_SIZE * sizeof(int), NULL, &ret);
   cl_mem c_mem_obj = clCreateBuffer(context, CL_MEM_READ_ONLY, LIST_SIZE * sizeof(int), NULL, &ret);
   cl_mem b_mem_obj = clCreateBuffer(context, CL_MEM_WRITE_ONLY, LIST_SIZE * sizeof(int), NULL, &ret);
 
   ret = clEnqueueWriteBuffer(command_queue, a_mem_obj, CL_TRUE, 0, LIST_SIZE * sizeof(int), A, 0, NULL, NULL);
   ret = clEnqueueWriteBuffer(command_queue, c_mem_obj, CL_TRUE, 0, LIST_SIZE * sizeof(int), C, 0, NULL, NULL);
 
   cl_program program = clCreateProgramWithSource(context, 1, (const char**)&source_str, (const size_t*)&source_size, &ret);
 
   ret = clBuildProgram(program, 1, &device_id, NULL, NULL, NULL);
 
   cl_kernel kernel = clCreateKernel(program, "krn", &ret);
 
   ret = clSetKernelArg(kernel, 0, sizeof(cl_mem), (void*)&a_mem_obj);
   ret = clSetKernelArg(kernel, 1, sizeof(cl_mem), (void*)&c_mem_obj);
   ret = clSetKernelArg(kernel, 2, sizeof(cl_mem), (void*)&b_mem_obj);
 
   size_t global_item_size = LIST_SIZE;
   size_t local_item_size = 128;
   ret = clEnqueueNDRangeKernel(command_queue, kernel, 1, NULL, &global_item_size, &local_item_size, 0, NULL, NULL);
 
  
   ret = clEnqueueReadBuffer(command_queue, b_mem_obj, CL_TRUE, 0, LIST_SIZE * sizeof(int), B, 0, NULL, NULL);
 
  
   for (int i = 0; i < LIST_SIZE; i++) {
       printf("%d. sum: %d\n", i, B[i]);
   }
   
   int min = B[0];
   int minIndex = 0;
   for (int i = 0; i < LIST_SIZE; i++) {
       if (B[i] < min) {
           min = B[i];
           minIndex = i;
       }
   }
   printf("\n\n%d. Minimum min(A+C) = %d\n", minIndex, min);
 
   ret = clFlush(command_queue);
   ret = clFinish(command_queue);
   ret = clReleaseKernel(kernel);
   ret = clReleaseProgram(program);
   ret = clReleaseMemObject(a_mem_obj);
   ret = clReleaseMemObject(c_mem_obj);
   ret = clReleaseMemObject(b_mem_obj);
   ret = clReleaseCommandQueue(command_queue);
   ret = clReleaseContext(context);
   delete[] source_str;
   delete[] A;
   delete[] B;
   delete[] C;
   return 0;
}

I wrote the code, but I don't understand at all what the flowchart should look like