骨牌无非两种放法,横着或竖着放,每次检查最r,c最小的没访问过的点即可.如果不能放就回溯. 最外面加一层认为已经访问过的位置,方便判断. #include<bits/stdc++.h> ; ; ; bool used[MAXB];// used Bone int pip[MAXP][MAXP];// pip 2 Bone ][]; ][]; int cnt; void dfs(int r,int c) { while(ans[r][c]) { ) { r++; c = -; } c++; }…
UVA - 524 Prime Ring Problem Time Limit:3000MS Memory Limit:0KB 64bit IO Format:%lld & %llu Description A ring is composed of n (even number) circles as shown in diagram. Put natural numbers into each circle separately, and the sum of number…
题意 把1到n这n个数以1为首位围成一圈 输出全部满足随意相邻两数之和均为素数的全部排列 直接枚举排列看是否符合肯定会超时的 n最大为16 利用回溯法 边生成边推断 就要快非常多了 #include<cstdio> using namespace std; const int N = 50; int p[N], vis[N], a[N], n; int isPrime(int k) { for(int i = 2; i * i <= k; ++i) if(k % i == 0)…
211 - The Domino Effect Time limit: 3.000 seconds A standard set of Double Six dominoes contains 28 pieces (called bones) each displaying two numbersfrom 0 (blank) to 6 using dice-like pips. The 28 bones, which are unique, consist of the followingcom…
Problem UVA211-The Domino Effect Accept:536 Submit:2504 Time Limit: 3000 mSec Problem Description Input The input file will contain several of problem sets. Each set consists of seven lines of eight integers from 0 through 6, representing an observ…
Description You are to write a program that tries to find an optimal coloring for a given graph. Colors are applied to the nodes of the graph and the only available colors are black and white. The coloring of the graph is called optimal if a maximum…
