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#include<iostream>\n#include<cstdio>\n#include<cstring>\n \ninline long long Max(long long A,long long B){\n\treturn A>B?A:B;\n}\nint n;\nint l[2000005],fa[2000005],nxt[2000005][26],sz[2000005];\nint h[2000005],v[2000005],to[2000005];\nchar ch[2000005];\nint cnt,nw,et;\ninline void add(int U,int V){\n\t++et,v[et]=V,to[et]=h[U],h[U]=et;\n}\ninline void prpr(){\n\tl[0]=0,fa[0]=-1,sz[0]=0;\n\tcnt=nw=0;\n}\nint p,q,np,nq;\ninline void psh(int c){\n\tnp=++cnt,p=nw,l[np]=l[nw]+1,sz[np]=1,nw=np;\n\twhile(p>=0&&!nxt[p][c]){\n\t\tnxt[p][c]=np;\n\t\tp=fa[p];\n\t}\n\tif(p==-1){\n\t\tfa[np]=0;\n\t\treturn;\n\t}\n\tq=nxt[p][c];\n\tif(l[p]+1==l[q]){\n\t\tfa[np]=q;\n\t\treturn;\n\t}\n\tnq=++cnt;\n\tfor(int i=0;i<26;++i){\n\t\tnxt[nq][i]=nxt[q][i];\n\t}\n\tfa[nq]=fa[q],fa[q]=fa[np]=nq,l[nq]=l[p]+1;\n\twhile(p>=0&&nxt[p][c]==q){\n\t\tnxt[p][c]=nq;\n\t\tp=fa[p];\n\t}\n}\nlong long ans=0;\ninline void dfs(int X){\n\tfor(int i=h[X];i;i=to[i]){\n\t\tdfs(v[i]);\n\t\tsz[X]+=sz[v[i]];\n\t}\n\tif(sz[X]>1){\n\t\tans=Max(ans,1ll*sz[X]*l[X]);\n\t}\n}\nvoid init(){\n\tstd::cin>>ch+1;\n\tn=strlen(ch+1);\n\tfor(int i=1;i<=n;++i){\n\t\tpsh(ch[i]-'a');\n\t}\n\tfor(int i=1;i<=cnt;++i){\n\t\tadd(fa[i],i);\n\t}\n\tdfs(0);\n\tprintf(\"%lld\",ans);\n}\n\nint main(){\n\tprpr();\n\tinit();\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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