牛客小白月赛7 B 自杀游戏

自杀游戏

思路：

sg函数

代码：

#pragma GCC optimize(2)
#pragma GCC optimize(3)
#pragma GCC optimize(4)
#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pi acos(-1.0)
#define LL unsigned long long
//#define mp make_pair
#define pb push_back
#define ls rt<<1, l, m
#define rs rt<<1|1, m+1, r
#define ULL unsigned LL
#define pll pair<LL, LL>
#define pii pair<int, int>
#define piii pair<pii, int>
#define mem(a, b) memset(a, b, sizeof(a))
#define fio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define fopen freopen("in.txt", "r", stdin);freopen("out.txt", "w", stout);
//head
 
const int N = 1e5 + 100;
int sg[N];
bool vis[100];
vector<int> vc;
int main() {
    int t, a, b;
    scanf("%d %d %d", &t, &a, &b);
    vc.pb(1);
    for (int i = a; i <= b; i++) vc.pb(i+1);
    for(int i = 1; i <= t; i++) {
        mem(vis, false);
        for (int a : vc) {
            if(a > i) break;
            vis[sg[i-a]] = true;
        }
        for (int j = 0; ; j++) {
            if(!vis[j]) {
                sg[i] = j;
                break;
            }
        }
    }
    if(sg[t]) puts("Alice");
    else puts("Bob");
    return 0;
}