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UVA 239 - Tempus et mobilius. Time and motion
题目链接
题意:这题题意也是吊得飞起,看了老半天,大概是这样:
有一个放球的队列,和3个轨道(说白了就是栈),一个容纳5,1个12,1个12,每1分钟队列出一个小球,放入栈,如果放入5的满了,就把5的放回队列,头一个放入12的,如果12的满了,就把12的放回队列,头一个放入另一个12的栈,如果又满了,就全部放回队列(头一个最后放回),问多少天之后,队列中小球会回复原来的状态
思路:先是模拟求出一天的情况,对应一个置换,然后就是求置换中循环的最大公倍数即可了
代码:
#include <stdio.h>
#include <string.h>
#include <queue>
#include <stack>
using namespace std;const int N = 7005;
int n, next[N], vis[N];long long gcd(long long a, long long b) {if (!b) return a;return gcd(b, a % b);
}long long lcm(long long a, long long b) {return a / gcd(a, b) * b;
}int main() {while (~scanf("%d", &n) && n) {queue<int> Q;stack<int> mins, fives, hours;for (int i = 0; i < n; i++)Q.push(i);for (int t = 0; t < 1440; t++) {int now = Q.front();Q.pop();if (mins.size() == 4) {for (int i = 0; i < 4; i++) {Q.push(mins.top());mins.pop();}if (fives.size() == 11) {for (int i = 0; i < 11; i++) {Q.push(fives.top());fives.pop();}if (hours.size() == 11) {for (int i = 0; i < 11; i++) {Q.push(hours.top());hours.pop();}Q.push(now);}else hours.push(now);}else fives.push(now);}else mins.push(now);}for (int i = 0; i < n; i++) {next[i] = Q.front();Q.pop();}memset(vis, 0, sizeof(vis));long long ans = 1;for (int i = 0; i < n; i++) {if (!vis[i]) {long long cnt = 1;vis[i] = 1;int t = next[i];while (!vis[t]) {cnt++;vis[t] = 1;t = next[t];}ans = lcm(ans, cnt);}}printf("%d balls cycle after %lld days.\n", n, ans);}return 0;
}
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