제출 #3815

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
3815		Qwaz	Make superpalindrome! (kriii1_M)	C++98	1 / 1	0 ms	1672 KiB

M

#include <cstdio>
#include <algorithm>

const int MAX=100020;

char data[MAX];
int len;

void calcLength(){
	while(data[len])
		len++;
}

int where[MAX];

void process(int s, int e){
	if(s >= e) return;
	
	int m = (e+s)>>1;
	if((e-s)%2){
		where[m] = e-s;

		process(s, m);
		process(m+1, e);
	} else {
		process(s, s+(e-s)/2);
		process(s+(e-s)/2, e);
	}
}

char min[MAX];
int pos;

void solve(){
	int i;
	for(i=0; i<len; i++){
		if(min[where[i]] == 0){
			min[where[i]] = data[i];
			if(data[i] != 'z')
				pos = i;
		} else {
			if(min[where[i]] < data[i])
				break;
			else if(min[where[i]] > data[i]){
				pos = i;
				min[where[i]]--;
				break;
			}
		}
	}

	min[where[pos]]++;

	for(i=0; i<len; i++){
		if(where[i]/2 > pos)
			putchar('a');
		else
			putchar(min[where[i]]);
	}

	puts("");
}

int main(){
	scanf("%s", data);

	calcLength();
	process(0, len);
	solve();

	return 0;
}

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