【BZOJ 2054】 疯狂的馒头
Input
第一行四个正整数N,M,p,q
Output
一共输出N行,第i行表示第i个馒头的最终颜色(如果最终颜色是白色就输出0)。
Sample Input
4 3 2 4
Sample Output
2
2
3
0
2
3
0
HINT
这道题线段树不会卡,因为时限是10s, 然后加入并查集优化一下就好了。
#include<cstdio> #include<algorithm> #include<iostream> #include<cmath> #include<cstring> using namespace std; int n, m, p, q; int fa[10000005], a[1000005]; int find(int x) { if(!fa[x] || fa[x] == x) return fa[x] = x; return fa[x] = find(fa[x]); }//递归 int x, y; int main() { scanf("%d %d %d %d", &n, &m, &p, &q); for(int i = m; i >= 1; i--) { x = ((long long)i * p + q) % n + 1; y = ((long long)i * q + p) % n + 1; if(x > y) swap(x,y); for(int j = find(x); j <= y;j = find(j)) { a[j] = i; fa[j] = j + 1; } } for(int i = 1; i <= n; i++) printf("%d\n", a[i]); return 0; }