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Use 2 hashmap starts and endsthen for (int i = 0; i < length; i++) { if (starts.containsKey(i)) { val += starts.get(i); } res[i] = val; if (ends.containsKey(i)) { val -= ends.get(i); } }也有一种tricky一点的方法,start index存val,end + 1存 - val, 然后一路求和过来就可以
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