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好吧,作比赛是贡献过pe。题目很简单,贴代码。/*
POJ: 3617 Best Cow Line
*/
#include <iostream>
#include <cstring>
#include <cstdio>
#include <string>
#define MaxN 2005
using namespace std;
char str[MaxN];
char res[MaxN];
int n;
int main()
{
//freopen("data.in", "rb", stdin);
while(scanf("%d", &n) != EOF) {
for(int i = 0; i < n; i++) {
char c;
cin >> c;
str[i] = c;
}
str[n] = 0;
int i = 0;
int j = n - 1;
int k = 0;
while(i < j) {
if(str[i] < str[j]) {
res[k] = str[i];
i++;
}
else if(str[i] > str[j]){
res[k] = str[j];
j--;
}
else {
int x = i + 1, y = j - 1;
while(x < y && str[x] == str[y]) {
x++;
y--;
}
if(str[x] < str[y]) {
res[k] = str[i];
i++;
}
else {
res[k] = str[j];
j--;
}
}
k++;
}
res[n-1] = str[i];
res[n] = 0;
int ans = 0;
for(int i = 0; i < n; i++) {
printf("%c", res[i]);
ans++;
if(ans % 80 == 0 && i < n - 1)
printf("\n");
}
}
return 0;
}
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