SPOJ GCJ1C09C (区间dp)

对监狱区间dp,也很好理解,不再赘述。
#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;

const int INF = 0x3f3f3f3f;
const int maxn = 10005;
int a[maxn];
int P, Q;

struct State{
    int s, e;
    State(int a, int b){s = a; e = b;}
    bool operator < (const State &b) const{
        return s < b.s || ((s == b.s) && (e < b.e));
    }
};

map ma;

int Dp(int s, int e){
    State c(s, e);
    if (ma.count(c)) return ma[c];
    int l = lower_bound(a, a + Q, s) - a;
    int r = upper_bound(a, a + Q, e) - a;
    if (l >= r) return ma[c] = 0;
    int ans = INF;
    for (int i = l; i < r; i++)
        ans = min(ans, e - s + Dp(s, a[i] - 1) + Dp(a[i] + 1, e));
    return ma[c] = ans;
}

int main()
{
    //freopen("1.txt", "r", stdin);
    int T, Case = 1;
    scanf("%d", &T);
    while (T--){
        scanf("%d%d", &P, &Q);
        memset(a, INF, sizeof(a));
        for (int i = 0; i < Q; i++)
            scanf("%d", &a[i]);

        ma.clear();
        printf("Case #%d: ", Case++);
        printf("%d\n", Dp(1, P));
    }
    return 0;
}

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