标签:sync out view 应该 algo efi 表示法 str cto
Input Each line contains one line the string S with length N (N <= 1000000) formed by lower case letters.OutputOutput four integers separated by one space, lexicographically fisrt string’s Rank (if there are multiple answers, choose the smallest one), the string’s times in the N generated strings, lexicographically last string’s Rank (if there are multiple answers, choose the smallest one), and its times also.Sample Input
abcder aaaaaa ababab
Sample Output
1 1 6 1 1 6 1 6 1 3 2 3
题意:找出一个字符串的循环列中最小和最大的那个字符串,并求出格数
题解:个数就是最小循环数,用kmp的next数组即可,然后用字符串的最小表示法求,最大的同理wa点:刚开始想直接暴力结果mle,莫名其妙,我以为应该是tle,结果改用kmp了之后,直接暴力求最小还是tle,
最后实在没办法看的最小表示法,还有一点就是自己脑残,写成了ans=(slen%ans ? ans:slen/ans)不能整除明明是1啊!!
不过还是没搞懂为啥不能直接循环求最小,时间复杂度明明是一样的,最小表示法时间复杂度也是O(n)啊
#include<map> #include<set> #include<cmath> #include<queue> #include<stack> #include<vector> #include<cstdio> #include<iomanip> #include<cstdlib> #include<cstring> #include<iostream> #include<algorithm> #define pi acos(-1) #define ll long long #define mod 10007 #define ls l,m,rt<<1 #define rs m+1,r,rt<<1|1 using namespace std; const double g=10.0,eps=1e-9; const int N=1000000+5,maxn=(1<<18)-1,inf=0x3f3f3f3f; int Next[N],slen; string str; void getnext() { int k=-1; Next[0]=-1; for(int i=1;i<slen;i++) { while(k>-1&&str[k+1]!=str[i])k=Next[k]; if(str[k+1]==str[i])k++; Next[i]=k; } } int solve(bool flag) { int i=0,j=1,k=0; while(i<slen&&j<slen&&k<slen){ int t=str[(i+k)%slen]-str[(j+k)%slen]; if(!t)k++; else { if(flag)t>0 ? i=i+k+1:j=j+k+1; else t<0 ? i=i+k+1:j=j+k+1; if(i==j)j++; k=0; } } return min(i,j); } int main() { ios::sync_with_stdio(false); cin.tie(0); // cout<<setiosflags(ios::fixed)<<setprecision(2); while(cin>>str){ slen=str.size(); getnext(); int ans=slen-Next[slen-1]-1; ans=(slen%ans ? 1:slen/ans); cout<<solve(1)+1<<" "<<ans<<" "<<solve(0)+1<<" "<<ans<<endl; } return 0; }
标签:sync out view 应该 algo efi 表示法 str cto
原文地址:http://www.cnblogs.com/acjiumeng/p/6825965.html