제출 #25702

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
25702		minimario	Swap (BOI16_swap)	C++14	21 / 100	0 ms	2804 KiB

swap

#include <bits/stdc++.h>
using namespace std;

const int MAX = 200005;
int sz;

int ar[MAX];

map<pair<int, int>, int >  memo;
int dp(int n, int v) {
	if (memo.find({n, v}) != memo.end()) { 
		return memo[{n, v}];
	}
	
	if (2*n+1 <= sz) {
		if (v < ar[2*n] && v < ar[2*n+1]) { }
		else if (ar[2*n] < v && ar[2*n] < ar[2*n+1]) {
			memo[{n, v}] = dp(2*n, v);
			return memo[{n, v}];
		}
		else if (ar[2*n+1] < ar[2*n] && ar[2*n+1] < v) {
			int mini = min(v, ar[2*n]);
			int maxi = max(v, ar[2*n]);
			int pos1 = dp(2*n, mini);
			int pos2 = dp(2*n+1, mini);
			if (v == mini) { memo[{n, v}] = min(pos1, pos2); }
			else { memo[{n, v}] = max(pos1, pos2); }
			return memo[{n, v}];
		}
	}
	else if (2*n == sz && v > ar[2*n]) { 
		memo[{n, v}] = dp(2*n, v);
		return memo[{n, v}];
	}
	memo[{n, v}] = n;
	return n;
}
void go(int n) {
	if (2*n+1 <= sz) {
		if (ar[n] < ar[2*n] && ar[n] < ar[2*n+1]) { }
		else if (ar[2*n] < ar[n] && ar[2*n] < ar[2*n+1]) {
			swap(ar[n], ar[2*n]); 
		}
		else if (ar[2*n+1] < ar[2*n] && ar[2*n+1] < ar[n]) {
			int mini = min(ar[n], ar[2*n]);
			int maxi = max(ar[n], ar[2*n]);
			int pos1 = dp(2*n, mini);
			int pos2 = dp(2*n+1, mini);
			ar[n] = ar[2*n+1];
			if (pos1 < pos2) { ar[2*n] = mini; ar[2*n+1] = maxi; }
			else { ar[2*n] = maxi; ar[2*n+1] = mini; }
		}
	}
	else if (2*n == sz && ar[n] > ar[2*n]) { swap(ar[n], ar[2*n]); }
	if (2*n <= sz) { go(2*n); }
	if (2*n+1 <= sz) { go(2*n+1); }
}

int main(int argc, char const *argv[])
{
	scanf("%d", &sz);
	for (int i = 1; i <= sz; ++i)
	{
		scanf("%d", &ar[i]);
	}
	go(1);
	for (int i = 1; i <= sz; ++i)
	{
		printf("%d", ar[i]);
		if (i != sz) { printf(" "); }
		else { printf("\n"); }
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

swap.cpp: In function 'int dp(int, int)':
swap.cpp:23:8: warning: unused variable 'maxi' [-Wunused-variable]
    int maxi = max(v, ar[2*n]);
        ^
swap.cpp: In function 'int main(int, const char**)':
swap.cpp:61:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &sz);
                  ^
swap.cpp:64:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &ar[i]);
                      ^

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 0 / 27
• Subtask 4: 0 / 20
• Subtask 5: 0 / 32