1. import requests
2. import numpy as np
3. import matplotlib.pyplot as plt
4.  
5.  
6. cf = "http://codeforces.com/api/"
7.  
8.  
9. def call(method, params):
10.     url = f"{cf}{method}"
11.     req = requests.get(url, params=params)
12.     if req.status_code == 200:
13.         return req.json()
14.  
15.  
16. """
17. Some Contests' id:
18.    Good Bye 2019 : 1270
19.    Edu 79        : 1279
20.    Global 6      : 1266
21.    Div3 #611     : 1283
22.    Div2 #608     : 1271
23.    Div1 #609     : 1268
24.    Codefest 19   : 1208
25. """
26.  
27. rating = [[1200, "gray"],
28.           [1400, "green"],
29.           [1600, "#03a89e"],
30.           [1900, "blue"],
31.           [2100, "#aa00aa"],
32.           [2400, "orange"],
33.           [3000, "red"],
34.           [9999, "black"]]
35.  
36. data = call("contest.ratingChanges", {"contestId": "1283"})["result"]
37. title = data[0]["contestName"]
38. print(title)
39.  
40. delta = np.zeros((len(data),), dtype=np.int64)
41. x = 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.     x[i] = data[i]["rank"]
46.     for j in range(len(rating)):
47.         if data[i]["oldRating"] < rating[j][0]:
48.             color.append(rating[j][1])
49.             break
50.  
51. plt.figure(figsize=(8, 6))
52. plt.title(title)
53. plt.xlabel("Rank")
54. plt.ylabel("Delta Rate")
55. plt.yticks(np.arange(-300, 301, 50))
56. plt.ylim(-300, 300)
57. plt.grid()
58. plt.scatter(x, delta, s=0.5, c=color)
59. plt.show()
60.