题解 | #【模板】静态矩阵和（二维前缀和）#
【模板】静态矩阵和（二维前缀和）
https://www.nowcoder.com/practice/111cdd09f7c442f696e8127d08ece90f
n,m,q = map(int, input().split()) //map
g = []
for i in range(n):
g.append(list(map(int, input().split())))
s = [[0]*(m+1) for _ in range(n+1)]
for i in range(1,n+1):
for j in range(1,m+1):
s[i][j] = s[i-1][j] + s[i][j-1] - s[i-1][j-1] + g[i-1][j-1]
for _ in range(q):
x1,y1,x2,y2 = map(int, input().split())
print(s[x2][y2] -s[x1-1][y2]-s[x2][y1-1]+s[x1-1][y1-1])
你只是陷入了短暂的低谷，你也一直有退路