EularProject 31: 2英镑的组合

Coin sums

Problem 31

In England the currency is made up of pound, £, and pence, p, and there are eight coins in general circulation:

1p, 2p, 5p, 10p, 20p, 50p, £1 (100p) and £2 (200p).

It is possible to make £2 in the following way:

1×£1 + 1×50p + 2×20p + 1×5p + 1×2p + 3×1p

How many different ways can £2 be made using any number of coins?

Answer:

73682Completed on Tue, 3 Feb 2015, 13:16

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见到这个题目我的第一感觉就是要用我的第一篇博文关于整数划分的一篇介绍：整数划分

 另一种思路就是使用完全背包问题求解的方法

#include <iostream>using namespace std;const int maxn = 200;int coin[8] = { 1, 2, 5, 10, 20, 50, 100, 200 };int dp[maxn+1];int m;int main(){int i, j;memset(dp, 0, sizeof(dp));dp[0] = 1;for (i = 0; i<8; i++){for (j = coin[i]; j <= maxn; j++){if (j >= coin[i])dp[j] += dp[j - coin[i]];}}printf("%d\n", dp[maxn]);return 0;}

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