Codeforces 6D Lizards and Basements 2 dfs+暴力

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#include<stdio.h>
#include<iostream>
#include<string.h>
#include<set>
#include<vector>
#include<map>
#include<math.h>
#include<queue>
#include<string>
#include<stdlib.h>
#include<algorithm>
using namespace std;
#define N 110
#define ll int

ll n, a, b;
ll h[N];
vector<int>G,ans;
void dfs(int u, bool hehe){//hehe=true表示u-1没死
	if(u==n && hehe==false){
		if(G.size()<ans.size())
			ans = G;
		return ;
	}
	int siz = 0;
	if(hehe) {
		while(h[u-1]>0)siz++,h[u-1]-=b, h[u]-=a, h[u+1]-=b, G.push_back(u);
	}
	if(h[u]>0) {
		while(h[u]>0) {
			dfs(u+1,true);
			h[u-1]-=b;
			h[u]-=a;
			h[u+1]-=b;
			siz++;
			G.push_back(u);
		}
	}
	dfs(u+1,false);
	h[u]+=a*siz;
	h[u+1]+=b*siz;
	h[u-1]+=b*siz;
	while(siz--)G.erase(G.end()-1);
}
int main(){
	ll i, j;
	while(~scanf("%d %d %d",&n,&a,&b)){
		G.clear(); ans.clear();
		for(i=1;i<=n;i++)scanf("%d",&h[i]), h[i]++;
		while(h[1]>0){
			h[2] -= a;
			h[1] -= b;
			h[3] -= b;
			ans.push_back(2);
		}
		while(h[n]>0){
			h[n-2] -= b;
			h[n-1] -= a;
			h[n] -= b;
			ans.push_back(n-1);
		}
		G = ans;
		for(i=1;i<=100;i++)ans.push_back(i);
		dfs(2,false);
		printf("%d\n",ans.size());
		for(i = 0; i < ans.size(); i++)printf("%d%c",ans[i],i==ans.size()-1?'\n':' ');
	}
	return 0;
}

/**/

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