Submission #13504

#	Time	Username	Problem	Language	Result	Execution time	Memory
13504		ainta	Parrots (IOI11_parrots)	C++98	100 / 100	237 ms	41560 KiB

encoder

#include "encoder.h"
#include "encoderlib.h"
static int P[271][257][72], T[300];
void encode(int N, int M[])
{
	int i, j, L, ck, k;
	for (k = 1; k <= 256; k++){
		if (P[0][k][0])break;
		P[0][k][0] = 1;
		for (i = 1; i < 270; i++){
			for (j = 0; j < 70; j++){
				T[j] += P[i - 1][k][j] * (k + i - 1);
				T[j + 1] += T[j] >> 8;
				T[j] &= 255;
			}
			for (j = 70; j >= 0; j--){
				if (T[j] % i){
					T[j - 1] += ((T[j] % i) << 8);
				}
				T[j] /= i;
			}
			for (j = 0; j <= 70; j++){
				P[i][k][j] = T[j];
				T[j] = 0;
			}
		}
		if (i != 270)break;
	}
	for (i = 1; i < 270; i++){
		for (j = 70; j >= 0; j--)if (P[i][256][j])break;
		if (j >= N)break;
	}
	L = i;
	int pv = 0;
	for (j = 0; j < N; j++)T[j] = M[j];
	for (i = L - 1; i >= 0; i--){
		while (1){
			ck = 0;
			for (j = 70; j >= 0; j--){
				if (!ck && T[j] - P[i][256-pv][j] != 0){
					if (T[j] < P[i][256-pv][j])break;
					ck = 1;
				}
				T[j] -= P[i][256-pv][j];
			}
			if (j != -1){
				for (j = j + 1; j <= 70; j++)T[j] += P[i][256 - pv][j];
				break;
			}
			for (j = 0; j < 70; j++){
				if (T[j] < 0)T[j + 1]--, T[j] += 256;
			}
			pv++;
		}
		send(pv);
	}
}

decoder

#include "decoder.h"
#include "decoderlib.h"
#include<stdio.h>
#include<algorithm>
using namespace std;
static int P[271][257][72], T[300], Res[300];
void decode(int N, int L, int X[])
{
	sort(X, X + L);
	int i, j, k, pv = 0;
	for (k = 1; k <= 256; k++){
		if (P[0][k][0])break;
		P[0][k][0] = 1;
		for (i = 1; i < 270; i++){
			for (j = 0; j < 70; j++){
				T[j] += P[i - 1][k][j] * (k + i - 1);
				T[j + 1] += T[j] >> 8;
				T[j] &= 255;
			}
			for (j = 70; j >= 0; j--){
				if (T[j] % i){
					T[j - 1] += ((T[j] % i) << 8);
				}
				T[j] /= i;
			}
			for (j = 0; j <= 70; j++){
				P[i][k][j] = T[j];
				T[j] = 0;
			}
		}
	}
	for (i = 0; i < L; i++){
		while (pv < X[i]){
			for (j = 0; j <= 70; j++){
				Res[j] += P[L - i - 1][256 - pv][j];
			}
			pv++;
		}
	}
	for (i = 0; i <= 70; i++){
		Res[i + 1] += (Res[i] >> 8);
		Res[i] &= 255;
	}
	for (i = 0; i < N; i++){
		output(Res[i]);
		Res[i] = 0;
	}
}

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