poj 1651 Multiplication Puzzle 【区间dp】
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Multiplication Puzzle
Time Limit: 1000MS Memory Limit: 65536KTotal Submissions: 7926 Accepted: 4892
Description
The multiplication puzzle is played with a row of cards, each containing a single positive integer. During the move player takes one card out of the row and scores the number of points equal to the product of the number on the card taken and the numbers on the cards on the left and on the right of it. It is not allowed to take out the first and the last card in the row. After the final move, only two cards are left in the row.
The goal is to take cards in such order as to minimize the total number of scored points.
For example, if cards in the row contain numbers 10 1 50 20 5, player might take a card with 1, then 20 and 50, scoring
10*1*50 + 50*20*5 + 10*50*5 = 500+5000+2500 = 8000
If he would take the cards in the opposite order, i.e. 50, then 20, then 1, the score would be
1*50*20 + 1*20*5 + 10*1*5 = 1000+100+50 = 1150.
The goal is to take cards in such order as to minimize the total number of scored points.
For example, if cards in the row contain numbers 10 1 50 20 5, player might take a card with 1, then 20 and 50, scoring
If he would take the cards in the opposite order, i.e. 50, then 20, then 1, the score would be
Input
The first line of the input contains the number of cards N (3 <= N <= 100). The second line contains N integers in the range from 1 to 100, separated by spaces.
Output
Output must contain a single integer - the minimal score.
Sample Input
610 1 50 50 20 5
Sample Output
3650
题意:给你n个数num[],去掉第i个数(不能是第一个和最后一个)的代价 = num[i] * num[i-1] * num[i+1]。现在问你去掉中间n-2个数的最小代价。
思路:很基础的区间dp了。
枚举最后一个去掉的数。状态转移
dp[i][j] = min(dp[i][j], dp[i][k-1] + dp[k+1][j] + num[k] * num[i-1] * num[j+1]);
AC代码:
#include <cstdio>#include <cstring>#include <cmath>#include <cstdlib>#include <algorithm>#include <queue>#include <stack>#include <map>#include <set>#include <vector>#define INF 0x3f3f3f3f#define eps 1e-8#define MAXN (100+10)#define MAXM (100000)#define Ri(a) scanf("%d", &a)#define Rl(a) scanf("%lld", &a)#define Rf(a) scanf("%lf", &a)#define Rs(a) scanf("%s", a)#define Pi(a) printf("%d\n", (a))#define Pf(a) printf("%.2lf\n", (a))#define Pl(a) printf("%lld\n", (a))#define Ps(a) printf("%s\n", (a))#define W(a) while(a--)#define CLR(a, b) memset(a, (b), sizeof(a))#define MOD 1000000007#define LL long long#define lson o<<1, l, mid#define rson o<<1|1, mid+1, r#define ll o<<1#define rr o<<1|1#define PI acos(-1.0)using namespace std;int dp[MAXN][MAXN], num[MAXN];int main(){ int n; while(Ri(n) != EOF) { for(int i = 0; i < n; i++) Ri(num[i]); CLR(dp, INF); for(int i = n-2; i >= 1; i--) { for(int j = i; j < n-1; j++) { if(i == j) dp[i][j] = num[i] * num[i-1] * num[i+1]; else { for(int k = i; k <= j; k++) { if(k == i) dp[i][j] = min(dp[i][j], dp[k+1][j] + num[k] * num[j+1] * num[i-1]); else if(k == j) dp[i][j] = min(dp[i][j], dp[i][k-1] + num[k] * num[j+1] * num[i-1]); else dp[i][j] = min(dp[i][j], dp[i][k-1] + dp[k+1][j] + num[k] * num[i-1] * num[j+1]); } } } } Pi(dp[1][n-2]); } return 0;}
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