1. # python3
2. import requests
3. import numpy as np
4. import matplotlib.pyplot as plt
5.  
6.  
7. cf = "http://codeforces.com/api/"
8.  
9.  
10. def call(method, params):
11.     url = f"{cf}{method}"
12.     req = requests.get(url, params=params)
13.     if req.status_code == 200:
14.         return req.json()
15.  
16.  
17. """
18. Some Contests' id:
19.    Good Bye 2019 : 1270
20.    Edu 79        : 1279
21.    Global 6      : 1266
22.    Div3 #611     : 1283
23.    Div2 #608     : 1271
24.    Div1 #609     : 1268
25.    Codefest 19   : 1208
26. """
27.  
28. rating = [[1200, "gray"],
29.           [1400, "green"],
30.           [1600, "#03a89e"],
31.           [1900, "blue"],
32.           [2100, "#aa00aa"],
33.           [2400, "orange"],
34.           [3000, "red"],
35.           [9999, "black"]]
36.  
37. data = call("contest.ratingChanges", {"contestId": "1208"})["result"]
38. title = data[0]["contestName"]
39. print(title)
40.  
41. delta = np.zeros((len(data),), dtype=np.int64)
42. color = []
43. for i in range(len(data)):
44.     delta[i] = data[i]["newRating"] - data[i]["oldRating"]
45.     for j in range(len(rating)):
46.         if data[i]["oldRating"] < rating[j][0]:
47.             color.append(rating[j][1])
48.             break
49.  
50. plt.figure(figsize=(8, 6))
51. plt.title(title)
52. plt.xlabel("Rank")
53. plt.ylabel("Delta Rate")
54. plt.yticks(np.arange(-300, 301, 50))
55. plt.ylim(-300, 300)
56. plt.grid()
57. plt.scatter(np.arange(len(delta)), delta, s=0.5, c=color)
58. plt.show()
59.