Submission #43730

#	Time	Username	Problem	Language	Result	Execution time	Memory
43730		baactree	Parrots (IOI11_parrots)	C++14	82 / 100	37 ms	2944 KiB

encoder

#include "encoder.h"
#include "encoderlib.h"
int r[4] = { 1,2,4,8 };
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 {
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < 4; j++) {
				for (int k = 0; k < r[j]; k++) {
					send((i << 2) + (M[i] & 3));
				}
				M[i] >>= 2;
			}
		}
	}
}

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]++;
		for (int i = 0; i < 64; i++) {
			for (int j = 0; j < 4; j++) {
				for(int k=0;k<4;k++) {
					if (cnt[i][j] & 1) ans[i] |= j << (k*2);
					cnt[i][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: 1 / 19