49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
#include <cstdio>
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#include <cstring>
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void exkmp(char s1[],char s2[],int next[],int ex[]) {
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int i,j,p;
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for (i=0,j=0,p=-1;s1[i]!='\0';i++,j++,p--) {
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if (p==-1) {
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j=0;
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do p++; while (s1[i+p]!='\0'&&s1[i+p]==s2[j+p]);
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ex[i]=p;
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} else if (next[j]<p) ex[i]=next[j];
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else if (next[j]>p) ex[i]=p;
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else {
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j=0;
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while (s1[i+p]!='\0'&&s1[i+p]==s2[j+p]) p++;
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ex[i]=p;
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}
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}
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ex[i]=0;
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}
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char s1[100100];
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char s2[100100];
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int ex[100100];
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int next[100100];
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int ls1,ls2;
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bool smallerThan(int i,int j) {
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if (ex[j]<i-j) return s1[j+ex[j]]<s2[ex[j]];
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if (next[i-j]<ls2-(i-j)) return s2[next[i-j]]<s2[i-j+next[i-j]];
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if (next[ls2-(i-j)]<(i-j)) return s2[ls2-(i-j)+next[ls2-(i-j)]]<s2[next[ls2-(i-j)]];
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return false;
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}
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int main() {
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int ans,i;
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while (scanf("%s%s",s1,s2)!=EOF) {
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exkmp(s2+1,s2,next,next+1);
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exkmp(s1,s2,next,ex);
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ls1=strlen(s1);
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ls2=strlen(s2);
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ans=0;
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for (i=0;i<ls1;i++) {
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if (smallerThan(i+1,ans)) ans=i+1;
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}
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for (i=0;i<ans;i++) printf("%c",s1[i]);
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printf("%s",s2);
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for (i=ans;i<ls1;i++) printf("%c",s1[i]);
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printf("\n");
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}
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return 0;
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}
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