34 lines
439 B
C
34 lines
439 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int cmp_str(const void *s1, const void *s2);
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int main(void)
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{
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int i;
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int n;
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int l;
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char s[100][100 + 1];
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scanf("%d %d", &n, &l);
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i = 0;
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while (i < n)
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{
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scanf("%s", s[i]);
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i++;
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}
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qsort(s, n, sizeof(s[0]), cmp_str);
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i = 0;
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while (i < n)
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{
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printf("%s", s[i]);
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i++;
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}
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puts("");
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}
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int cmp_str(const void *s1, const void *s2)
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{
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return (strcmp(s1, s2));
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}
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