http://www.jungol.co.kr/bbs/board.php?bo_table=pbank&wr_id=1721&sca=99&sfl=wr_hit&stx=2461 JUNGOL www.jungol.co.kr #include struct period { int start, end; } flo[100010], tmp[100010]; int N, ans; void mergesort(int s, int e) { if (s >= e) return; int m = (s + e) / 2, k = s, a = s, b = m + 1; mergesort(s, m); mergesort(m + 1, e); while (a