Submission #27090

#	Time	Username	Problem	Language	Result	Execution time	Memory
27090		khsoo01	Swap (BOI16_swap)	C++11	100 / 100	116 ms	13956 KiB

swap

#include<bits/stdc++.h>
using namespace std;
const int N = 200005, inf = 1e9;
int n, a[N];

vector<int> dt[N];

void upd (int I, int J, int V) {
	while(dt[I].size() <= J) dt[I].push_back(0);
	dt[I][J] = max(dt[I][J], V);
}

int get (int I, int V) {
	for(int i=0;i<dt[I].size();i++) {
		if(V < dt[I][i]) return i;
	}
	return inf;
}

void calc (int I) {
	if(2*I > n) {
		upd(I, 0, inf);
		return;
	}
	calc(2*I);
	if(2*I+1 > n) {
		upd(I, 0, a[2*I]); upd(I, 1, inf);
		return;
	}
	calc(2*I+1);

	int A = min(a[2*I], a[2*I+1]), B = a[2*I]+a[2*I+1]-A, F = 0;
	upd(I, 0, A);
	if(a[2*I] < a[2*I+1]) {
		for(auto &T : dt[2*I]) dt[I].push_back(T);
		return;
	}

	for(int i=0, j=0; i<dt[2*I].size() && j<dt[2*I+1].size(); ) {
		int P = dt[2*I][i], Q = dt[2*I+1][j], R = min(P, Q);
		if(!F) {
			if(B < R) {
				F = 1 + (i > j);
				upd(I, min(i, j)+1, B);
			}
			else upd(I, min(i, j)+1, R);
		}
		if(F) upd(I, (F-1?i:j)+1, R);
		P < Q ? i++ : j++;
	}

	for(int i=1;i<dt[I].size();i++) {
		dt[I][i] = max(dt[I][i], dt[I][i-1]);
	}
}

void solve (int I) {
	if(2*I > n) {
		return;
	}
	if(2*I+1 > n) {
		if(a[2*I] < a[I]) swap(a[2*I], a[I]);
		return;
	}
	if(a[I] < a[2*I] && a[I] < a[2*I+1]) {
		return;
	}
	if(a[2*I] < a[I] && a[2*I] < a[2*I+1]) {
		swap(a[2*I], a[I]); return;
	}

	int A = min(a[I], a[2*I]), B = a[I]+a[2*I]-A;
	a[I] = a[2*I+1];
	if(get(2*I, A) <= get(2*I+1, A)) {
		a[2*I] = A; a[2*I+1] = B;
	}
	else {
		a[2*I] = B; a[2*I+1] = A;
	}
}

int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++) {
		scanf("%d",&a[i]);
	}
	calc(1);
	for(int i=1;i<=n;i++) {
		solve(i);
		printf("%d ",a[i]);
	}
}

Compilation message (stderr)

swap.cpp: In function 'void upd(int, int, int)':
swap.cpp:9:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(dt[I].size() <= J) dt[I].push_back(0);
                     ^
swap.cpp: In function 'int get(int, int)':
swap.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<dt[I].size();i++) {
               ^
swap.cpp: In function 'void calc(int)':
swap.cpp:39:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0, j=0; i<dt[2*I].size() && j<dt[2*I+1].size(); ) {
                     ^
swap.cpp:39:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0, j=0; i<dt[2*I].size() && j<dt[2*I+1].size(); ) {
                                         ^
swap.cpp:52:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<dt[I].size();i++) {
               ^
swap.cpp: In function 'int main()':
swap.cpp:84:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
swap.cpp:86:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
                    ^

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