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2018ICPC徐州網路賽 B.BE, GE or NE 記憶化搜尋

#include<bits/stdc++.h>
#define inf 0x3f3f3f3f
#define ms(x) memset(x,0,sizeof(x))
#define mf(x) memset(x,inf,sizeof(x))
using namespace std;
const int N = 1041;
const int M = 205;
int n, m, k, l;
int dp[N][M];
struct node{
    int a, b, c;
}q[N];
int dfs(int now, int tpans){
    if(now>=n) return tpans-100;
    if(dp[now][tpans]!=inf) return dp[now][tpans];
    int ans = tpans-100;
    if(now%2==0){
        int tmp = -100;
        if(q[now].a > 0){
            int _ans = min(100, ans + q[now].a);
            tmp = max(dfs(now+1, _ans+100), tmp);
        }
        if(q[now].b > 0){
            int _ans = max(-100, ans - q[now].b);
            tmp = max(dfs(now+1, _ans+100), tmp);
        }
        if(q[now].c > 0){
            tmp = max(tmp, dfs(now+1, -ans + 100));
        }
        dp[now][tpans] = tmp;
        return tmp;
    }
    else{
        int tmp = 100;
        if(q[now].a > 0){
            int _ans = min(100, ans + q[now].a);
            tmp = min(dfs(now+1, _ans+100), tmp);
        }
        if(q[now].b > 0){
            int _ans = max(-100, ans - q[now].b);
            tmp = min(dfs(now+1, _ans+100), tmp);
        }
        if(q[now].c > 0){
            tmp = min(tmp, dfs(now+1, -ans + 100));
        }
        dp[now][tpans] = tmp;
        return tmp;
    }
}
int main() {

    while(scanf("%d%d%d%d",&n,&m,&k,&l)!=EOF) {
        mf(dp);
        for(int i=0;i<n;i++){
            scanf("%d%d%d",&q[i].a,&q[i].b,&q[i].c);
        }
        int ans = dfs(0, m+100);
        //cout<<ans<<endl;
        if(ans >= k){
            puts("Good Ending");
        }
        else if(ans <= l ){
            puts("Bad Ending");
        }
        else puts("Normal Ending");
    }
    return 0;
}