leetcode：1504. Count the number of all 1 sub rectangles

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• 1504. The statistics are complete 1 Sub rectangle

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title

problem ：

• Must be in the form of 0 Matrix of behavior base , Its interior is full of 1 How many
• Must be in the form of 1 Matrix of behavior base , Its interior is full of 1 How many
• Must be in the form of 2 Matrix of behavior base , Its interior is full of 1 How many
• …
• Then add up all the above , That's the answer.

that , A matrix based on a certain behavior , Its interior is full of 1 How many , How should I ask ？