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一组测试数据3 3
1 2
-3 2
2 4
3 -3
1 2
-3 2
2 1
0 0
Case 1: -1
Case 2: -1
注意: 用qsort时 要这么用
int cmp(const void *a, const void *b)
{
return (*(range *)a).x > (*(range *)b).x ? 1 : -1;
}
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