http://www.jungol.co.kr/bbs/board.php?bo_table=pbank&wr_id=421&sca=99&sfl=wr_hit&stx=1141 JUNGOL www.jungol.co.kr #include struct cow { int idx; int height; }; cow st1[80010], st2[180010]; int sp1, sp2, N; unsigned long long sum; void push_back(cow C) { st1[sp1++] = C; } void push_back2(cow C) { st2[sp2++] = C; } cow pop() { cow empty; empty.height = empty.idx = -1; if (sp1 != 0)return st1[--sp1..