DFS即可過~

#include <cstdio>
#include <algorithm>
#include <cstring>
 
int Map[10005],n,ban[10005],tot;
 
void dfs(int h){
    if(h>n){
        if(Map[h-1]+Map[h-2]==ban[h-1]) tot++;
        return;
    }
    if(h==1){
        dfs(h+1);
        Map[h]=1;
        dfs(h+1);
        Map[h]
 
=0;
    }
    else if(Map[h-1]+Map[h-2]==ban[h-1]){
        dfs(h+1);
    }
    else if(Map[h-1]+Map[h-2]+1==ban[h-1]){
        Map[h]=1;
        dfs(h+1);
        Map[h]=0;
    }
    else if(Map[h-1]+Map[h-2]+1 < ban[h-1] || Map[h-1]+Map[h-2]+1 > ban[h-1]) return; 
}
 
int main(){
    scanf(
 
"%d",&n);
    for(int i=1;i<=n;i++) scanf("%d",&ban[i]);
    dfs(1);
    printf("%d\n",tot);
    return 0;
}

BZOJ 1088 SCOI2005 掃雷