leetcode-problemset/leetcode-cn/originData/[no content]number-of-substrings-with-fixed-ratio.json

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            "categoryTitle": "Algorithms",
            "boundTopicId": 1998438,
            "title": "Number of Substrings With Fixed Ratio",
            "titleSlug": "number-of-substrings-with-fixed-ratio",
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            "hints": [
                "Let Func(i) denote the number of 0’s in the prefix [0…i]. We want to find the number of pairs of indices L and R such that Func(R) - Func(L) : R - L - Func(R) + Func(L) = num1 : num2.",
                "It is better to simplify the formula.",
                "Func(R) * (num1 + num2) - R * num1 = Func(L) * (num1 + num2) - L * num1.",
                "Iterate from left to right and use a hash map to count the number of indices having the same value for the above formula."
            ],
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            "metaData": "{\n  \"name\": \"fixedRatio\",\n  \"params\": [\n    {\n      \"name\": \"s\",\n      \"type\": \"string\"\n    },\n    {\n      \"type\": \"integer\",\n      \"name\": \"num1\"\n    },\n    {\n      \"type\": \"integer\",\n      \"name\": \"num2\"\n    }\n  ],\n  \"return\": {\n    \"type\": \"long\"\n  }\n}",
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