제출 #16563

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
16563		gs14004	정렬하기 (IOI15_sorting)	C++14	0 / 100	3 ms	384 KiB

sorting

#include "sorting.h"
#include <algorithm>
using namespace std;

int *s, *x, *y, *p, *q, n;
int obj[200005], cur[200005];
int orev[200005], crev[200005];

bool trial(int t){
	for(int i=0; i<n; i++){
		obj[i] = i;
		cur[i] = s[i];
		crev[s[i]] = i;
	}
	for(int i=t-1; i>=0; i--){
		swap(obj[x[i]], obj[y[i]]);
		orev[obj[x[i]]] = x[i];
		orev[obj[y[i]]] = y[i];
	}
	int pt = 0;
	for(int i=0; i<t; i++){
		swap(obj[x[i]], obj[y[i]]);
		swap(cur[x[i]], cur[y[i]]);
		crev[cur[x[i]]] = x[i];
		orev[obj[x[i]]] = x[i];
		crev[cur[y[i]]] = y[i];
		orev[obj[y[i]]] = y[i];
		while(pt < n && crev[pt] == orev[pt]) pt++;
		if(pt == n){
			p[i] = q[i] = 0;
			continue;
		}
		int p1 = crev[pt];
		int p2 = orev[pt];
		p[i] = p1;
		q[i] = p2;
		swap(cur[p1], cur[p2]);
		crev[cur[p1]] = p1;
		crev[cur[p2]] = p2;
	}
	while(pt < n && crev[pt] == orev[pt]) pt++;
	return (pt == n);
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
	n = N, s = S, x = X, y = Y, p = P, q = Q;
	int s = 0, e = min(N, M);
	while(s != e){
		int m = (s+e)/2;
		if(trial(m)) e = m;
		else s = m+1;
	}
	trial(s);
	return s;
}

컴파일 시 표준 에러 (stderr) 메시지

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:47:6: warning: declaration of 's' shadows a global declaration [-Wshadow]
  int s = 0, e = min(N, M);
      ^
sorting.cpp:5:6: note: shadowed declaration is here
 int *s, *x, *y, *p, *q, n;
      ^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 12
• Subtask 3: 0 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26