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题目：
题解：
typedef struct SummaryRanges{int left,right;struct SummaryRanges *pre,*next;
} SummaryRanges;/** Initialize your data structure here. */SummaryRanges* summaryRangesCreate() {SummaryRanges *head = malloc(sizeof(SummaryRanges)),*rear = malloc(sizeof(SummaryRanges));head->next = head->pre = rear;rear->next = rear->pre = head;head->left = 0;return head;
}
SummaryRanges *insert(SummaryRanges *head,SummaryRanges *rear,int val){SummaryRanges *p = head->next;while(p != rear){if(p->left <= val && val <= p->right) return NULL;else if(p->right < val) p = p->next;else break;}SummaryRanges *q = malloc(sizeof(SummaryRanges));q->left = q->right = val;q->next = p,q->pre = p->pre;p->pre->next = q,p->pre = q;++head->left;return q;
}
void summaryRangesAddNum(SummaryRanges* obj, int val) {SummaryRanges *head = obj,*rear = obj->pre;SummaryRanges *p = insert(head,rear,val);if(!p) return;int f1 = p->pre != head && p->pre->right+1 == p->left,f2 = p->next != rear && p->next->left-1 == p->right;if(f1 && f2){p->pre->right = p->next->right;p->pre->next = p->next->next;p->next->next->pre = p->pre;head->left -= 2;free(p->next);free(p);}else if(f1){p->pre->right = p->right;p->pre->next = p->next;p->next->pre = p->pre;head->left--;free(p);}else if(f2){p->next->left = p->left;p->next->pre = p->pre;p->pre->next = p->next;head->left--;free(p);}
}int** summaryRangesGetIntervals(SummaryRanges* obj, int* rs, int** rcs) {SummaryRanges *p = obj->next,*rear = obj->pre;int **ret = malloc((obj->left)*sizeof(int*));*rs = 0;while(p != rear){ret[*rs] = malloc(2*sizeof(int));ret[*rs][0] = p->left,ret[*rs][1] = p->right;(*rs)++;p = p->next;}*rcs = malloc((*rs)*sizeof(int));for(int i = 0;i < *rs;++i) (*rcs)[i] = 2;return ret;
}void summaryRangesFree(SummaryRanges* obj) {SummaryRanges *p = obj->next,*rear = obj->pre;while(p != rear){SummaryRanges *temp = p->next;free(p);p = temp;}free(rear);free(obj);
}/*** Your SummaryRanges struct will be instantiated and called as such:* SummaryRanges* obj = summaryRangesCreate();* summaryRangesAddNum(obj, val);* int** param_2 = summaryRangesGetIntervals(obj, retSize, retColSize);* summaryRangesFree(obj);
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