69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
//http://contest-hunter.org:83/contest/0x18%E3%80%8C%E5%9F%BA%E6%9C%AC%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E3%80%8D%E7%BB%83%E4%B9%A0/1813%20%E5%8F%8C%E6%A0%88%E6%8E%92%E5%BA%8F
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#include<cstdio>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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const int maxn=1005;
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int T,n,a[maxn],co[maxn],s1[maxn],c1,s2[maxn],c2;
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struct JUDGE
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{
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int k[maxn];
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struct Edge { int v; Edge *nxt; };
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Edge mem[maxn*maxn*2],*G[maxn],*ecnt;
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inline void init()
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{
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memset(G,0,sizeof(G)); ecnt=mem;
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memset(co,0,sizeof(co));
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}
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inline void AddEdge(int u,int v) { ecnt->v=v; ecnt->nxt=G[u]; G[u]=ecnt++; }
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bool dfs(int u,int c)
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{
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if(co[u]) return co[u]==c;
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co[u]=c;
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for(Edge *it=G[u];it;it=it->nxt) if(!dfs(it->v,3-c)) return false;
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return true;
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}
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bool ok()
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{
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k[n+1]=n+1;
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for(int i=n;i>=1;i--) k[i]=min(k[i+1],a[i]);
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for(int i=1;i<=n;i++) for(int j=i+1;j<=n;j++)
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if(k[j+1]<a[i]&&a[i]<a[j])
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{
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AddEdge(i,j);
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AddEdge(j,i);
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}
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for(int i=1;i<=n;i++) if(!co[i]&&!dfs(i,1)) return false;
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return true;
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}
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}jg;
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inline void solve()
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{
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scanf("%d",&n);
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for(int i=1;i<=n;i++) scanf("%d",&a[i]);
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jg.init();
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if(!jg.ok()) { puts("0"); return; }
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int now=1; c1=c2=0;
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for(int i=1;i<=n;i++)
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{
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if(co[i]==1) { s1[c1++]=a[i]; printf("a "); }
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else { s2[c2++]=a[i]; printf("c "); }
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while(true)
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{
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if(c1&&s1[c1-1]==now) { printf("b "); c1--; now++; }
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else if(c2&&s2[c2-1]==now) { printf("d "); c2--; now++; }
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else break;
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}
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}
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puts("");
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}
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d",&T);
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while(T-->0) solve();
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return 0;
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}
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