uva 10003(区间dp)

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;

const int maxn=60;
const int nil=(1<<29);
int a[maxn];
int dp[maxn][maxn];

int main(){
    int n;
    int l;
    while(scanf("%d",&l)&&l){
    scanf("%d",&n);
    memset(dp,0,sizeof(dp));
    for (int i=1;i<=n;i++){
        scanf("%d",&a[i]);
    }
    a[0]=0;
    a[n+1]=l;
    for (int i=1;i<=n+1;i++){//枚举切点的长度，即从a[i],数组的长·
        for (int j=0;j+i<=n+1;j++){//枚举从a[i]数组的哪个位置切
            int p=i+j;
            int minn=nil;
            for (int k=j+1;k<p;k++){
                int temp;
                temp=dp[j][k]+dp[k][p]+a[p]-a[j];
                if(temp<minn) minn=temp;
            }
            if(minn!=nil) dp[j][p]=minn;
        }
    }
    printf("The minimum cutting is %d.\n",dp[0][n+1]);
  }
return 0;
}