题目：

题解：

int cmp(int** a, int** b) {
    return (*a)[1] - (*b)[1];
}

int eraseOverlapIntervals(int** intervals, int intervalsSize, int* intervalsColSize) {
    if (intervalsSize == 0) {
        return 0;
    }

    qsort(intervals, intervalsSize, sizeof(int*), cmp);

    int right = intervals[0][1];
    int ans = 1;
    for (int i = 1; i < intervalsSize; ++i) {
        if (intervals[i][0] >= right) {
            ++ans;
            right = intervals[i][1];
        }
    }
    return intervalsSize - ans;
}