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

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        "question": {
            "questionId": "2629",
            "questionFrontendId": "2489",
            "categoryTitle": "Algorithms",
            "boundTopicId": 1998438,
            "title": "Number of Substrings With Fixed Ratio",
            "titleSlug": "number-of-substrings-with-fixed-ratio",
            "content": null,
            "translatedTitle": "固定比率的子字符串数",
            "translatedContent": null,
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            "difficulty": "Medium",
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            "topicTags": [
                {
                    "name": "Hash Table",
                    "slug": "hash-table",
                    "translatedName": "哈希表",
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "Math",
                    "slug": "math",
                    "translatedName": "数学",
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "String",
                    "slug": "string",
                    "translatedName": "字符串",
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "Prefix Sum",
                    "slug": "prefix-sum",
                    "translatedName": "前缀和",
                    "__typename": "TopicTagNode"
                }
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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."
            ],
            "solution": null,
            "status": null,
            "sampleTestCase": "\"0110011\"\n1\n2",
            "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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