Submission #43735

#	Time	Username	Problem	Language	Result	Execution time	Memory
43735		baactree	Parrots (IOI11_parrots)	C++14	81 / 100	11 ms	2432 KiB

encoder

#include "encoder.h"
#include "encoderlib.h"
#include <bits/stdc++.h>
using namespace std;
void encode(int N, int M[]){
	if (N <= 32) {
		for (int i = 0; i < N; i++) {
			int a = M[i] >> 4;
			int b = M[i] & (0xf);
			send(((i * 2) << 2) + (a >> 2));
			send(((i * 2) << 2) + (a >> 2));
			send(((i * 2) << 2) + (a & 3));
			send(((i * 2 + 1) << 2) + (b >> 2));
			send(((i * 2 + 1) << 2) + (b >> 2));
			send(((i * 2 + 1) << 2) + (b & 3));
		}
	}
	else {
		int cnt = 0;
		int temp[64];
		memcpy(temp, M, sizeof(temp));
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < 4; j++) {
				int now = M[i] & 3;
				cnt += now;
				M[i] /= 4;
			}
		}
		memcpy(M, temp, sizeof(temp));
		if (cnt > N * 6) {
			for (int i = 0; i < N; i++) {
				for (int j = 0; j < 4; j++) {
					int now = M[i] & 3;
					now = 3 - now;
					while (now--)
						send((i << 2) + j);
					M[i] /= 4;
				}
			}
			send(0x3f);
			send(0x3f);
			send(0x3f);
			send(0x3f);
		}
		else {
			for (int i = 0; i < N; i++) {
				for (int j = 0; j < 4; j++) {
					int now = M[i] & 3;
					while (now--)
						send((i << 2) + j);
					M[i] /= 4;
				}
			}
		}
	}
}

decoder

#include "decoder.h"
#include "decoderlib.h"
void decode(int N, int L, int X[]){
	if (N <= 32) {
		int ans[32] = { 0, }, cnt[64][4] = { 0, };
		for (int i = 0; i < L; i++) 
			cnt[X[i] >> 2][X[i] & 3]++;
		for (int i = 0; i < 64; i++) {
			for (int j = 0; j < 4; j++) {
				if (cnt[i][j] == 1) {
					ans[i / 2] |= i & 1 ? j : j << 4;
				}
				else if (cnt[i][j] == 2) {
					ans[i / 2] |= i & 1 ? j << 2 : j << 6;
				}
				else if (cnt[i][j] == 3) {
					ans[i / 2] |= i & 1 ? (j * 4 + j) : (j * 4 + j) << 4;
				}
			}
		}
		for (int i = 0; i < N; i++) {
			output(ans[i]);
		}
	}
	else {
		int ans[64] = { 0, }, cnt[64][4] = { 0, };
		for (int i = 0; i < L; i++)
			cnt[X[i] >> 2][X[i] & 3]++;
		if(cnt[63][3]>=4){
			cnt[63][3] -= 4;
			for (int i = 0; i < 64; i++) {
				for (int j = 0; j < 4; j++) {
					ans[i] |= ((3 - cnt[i][j]) << (j * 2));
				}
			}
		}
		else {
			for (int i = 0; i < 64; i++) {
				for (int j = 0; j < 4; j++) {
					ans[i] |= (cnt[i][j] << (j * 2));
				}
			}
		}
		for (int i = 0; i < N; i++) {
			output(ans[i]);
		}
	}
}

• Subtask 1: 17 / 17
• Subtask 2: 17 / 17
• Subtask 3: 18 / 18
• Subtask 4: 29 / 29
• Subtask 5: 0 / 19