202104-1 灰度直方圖

題目鏈接

http://118.190.20.162/view.page?gpid=T128

代碼

n,m,l = map(int,input().split()) res = [0 for i in range(l)] for i in range(n):temp = list(map(int,input().split()))for j in range(m):res[temp[j]] += 1 print(' '.join(map(str,res)))

202104-2 鄰域均值

題目鏈接

http://118.190.20.162/view.page?gpid=T127

題型分析

二維前綴和！

代碼

n, l, r, t = map(int, input().split()) A = [] res = 0 # 記錄小于閾值t的像素個數 for i in range(n):A.append(list(map(int, input().split())))s = [[0 for i in range(n)] for i in range(n)] # 處理二維前綴和 for i in range(n):for j in range(n):if i == 0 and j == 0:s[i][j] = A[i][j]elif j == 0:s[i][j] = s[i - 1][j] + A[i][j]elif i == 0:s[i][j] = s[i][j - 1] + A[i][j]else:s[i][j] = s[i - 1][j] + s[i][j - 1] - s[i - 1][j - 1] + A[i][j]for i in range(n):top = i - r if i - r >= 0 else 0bottom = i + r if i + r < n else n - 1for j in range(n):right = j + r if j + r < n else n - 1left = j - r if j - r >= 0 else 0number = (right - left + 1) * (bottom - top + 1) # 個數if top == 0 and left == 0:sum = s[bottom][right]elif top == 0:sum = s[bottom][right] - s[bottom][left - 1]elif left == 0:sum = s[bottom][right] - s[top - 1][right]else:sum = s[bottom][right] - s[top - 1][right] - s[bottom][left - 1] + s[top - 1][left - 1]avg = sum / numberif avg <= t:res += 1 print(res)

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