Problem A : Bit_ImageMap1
제한시간: 0 ms 메모리제한: 0 MB
가로 세로 각각 256개의 bit로 이루어진 imagemap이 있다.
unsigned char imagemap[256][32];
이 imagemap 내에 0 ~ 14 사이의 정수 4096개를 저장하는 encode() 함수를 설계하라.
반환된 imagemap 이미지는 전송 과정에서 노이즈에 의해 일부 bit가 임의의 0 또는 1로 변경될 수 있고,
90, 180, 270도로 회전될 수도 있으며, 가로 또는 세로 방향 대칭으로 변경될 수 있다.
이 imagemap 데이터를 분석하여, 최초 저장된 4096개 정수를 반환하는 decode() 함수를 작성하라.
//--------------main.cpp-----------------
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <memory.h>
extern void encode(unsigned char imagemap[256][32], unsigned char data[4096]);
extern void decode(unsigned char data[4096], unsigned char imagemap[256][32]);
static void setpixel(unsigned char imagemap[256][32], int x, int y, int pixel)
{
unsigned char mask = 0x80 >> (x % 8);
if (pixel == 0) imagemap[y][x / 8] &= ~mask;
else imagemap[y][x / 8] |= mask;
}
static int getpixel(unsigned char imagemap[256][32], int x, int y)
{
unsigned char mask = 0x80 >> (x % 8);
if ((imagemap[y][x / 8] & mask) == 0) return 0;
else return 1;
}
static void noise(unsigned char imagemap[256][32])
{
for (register int y = 0; y < 256; y += 2)
for (register int x = 0; x < 256; x += 2)
{
setpixel(imagemap, x + rand() % 2, y + rand() % 2, 0);
setpixel(imagemap, x + rand() % 2, y + rand() % 2, 1);
}
}
static void rotate(unsigned char imagemap[256][32], int angle)
{
static unsigned char buffer[256][32];
if (angle != 0)
{
switch (angle)
{
case 1: // 90
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, y, 255 - x));
break;
case 2: // 180
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, 255 - x, 255 - y));
break;
case 3: // 270
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, 255 - y, x));
break;
}
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(imagemap, x, y, getpixel(buffer, x, y));
}
}
static void flip(unsigned char imagemap[256][32], int mode)
{
static unsigned char buffer[256][32];
if (mode != 0)
{
switch (mode)
{
case 1: // horizontal
for (register int x = 0; x < 256; x++)
for (register int y = 0; y < 256; y++)
setpixel(buffer, x, y, getpixel(imagemap, x, 255 - y));
break;
case 2: // vertical
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, 255 - x, y));
break;
}
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(imagemap, x, y, getpixel(buffer, x, y));
}
}
int main(void)
{
static const int TCSIZE = 1024;
static unsigned char data[TCSIZE][4096] = { 0 };
static unsigned char org[TCSIZE][4096] = { 0 };
static unsigned char result[TCSIZE][4096] = { 0 };
static unsigned char imagemap[TCSIZE][256][32] = { 0 };
srand(3); // The seed will be changed.
for (register int TC = 0; TC < TCSIZE; TC++)
for (register int c = 0; c < 4096; c++)
org[TC][c] = data[TC][c] = rand() % 15;
int PERFORMANCE = 10000;
time_t start = clock();
for (register int TC = 0; TC < TCSIZE; TC++)
encode(imagemap[TC], data[TC]);
PERFORMANCE -= (clock() - start) / (CLOCKS_PER_SEC / 1000);
for (register int TC = 0; TC < TCSIZE; TC++)
{
noise(imagemap[TC]);
rotate(imagemap[TC], rand() % 4);
flip(imagemap[TC], rand() % 3);
}
start = clock();
for (register int TC = 0; TC < TCSIZE; TC++)
decode(result[TC], imagemap[TC]);
PERFORMANCE -= (clock() - start) / (CLOCKS_PER_SEC / 1000);
int PASS = 0;
for (register int TC = 0; TC < TCSIZE; TC++)
if (memcmp(org[TC], result[TC], 4096) == 0) PASS++;
printf("SCORE: %d\n", PASS * 10000 + PERFORMANCE);
return 0;
}
//--------------user.cpp-----------------
void encode(unsigned char imagemap[256][32], unsigned char data[4096])
{
}
void decode(unsigned char data[4096], unsigned char imagemap[256][32])
{
}
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <memory.h>
extern void encode(unsigned char imagemap[256][32], unsigned char data[4096]);
extern void decode(unsigned char data[4096], unsigned char imagemap[256][32]);
static void setpixel(unsigned char imagemap[256][32], int x, int y, int pixel)
{
unsigned char mask = 0x80 >> (x % 8);
if (pixel == 0) imagemap[y][x / 8] &= ~mask;
else imagemap[y][x / 8] |= mask;
}
static int getpixel(unsigned char imagemap[256][32], int x, int y)
{
unsigned char mask = 0x80 >> (x % 8);
if ((imagemap[y][x / 8] & mask) == 0) return 0;
else return 1;
}
static void noise(unsigned char imagemap[256][32])
{
for (register int y = 0; y < 256; y += 2)
for (register int x = 0; x < 256; x += 2)
{
setpixel(imagemap, x + rand() % 2, y + rand() % 2, 0);
setpixel(imagemap, x + rand() % 2, y + rand() % 2, 1);
}
}
static void rotate(unsigned char imagemap[256][32], int angle)
{
static unsigned char buffer[256][32];
if (angle != 0)
{
switch (angle)
{
case 1: // 90
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, y, 255 - x));
break;
case 2: // 180
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, 255 - x, 255 - y));
break;
case 3: // 270
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, 255 - y, x));
break;
}
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(imagemap, x, y, getpixel(buffer, x, y));
}
}
static void flip(unsigned char imagemap[256][32], int mode)
{
static unsigned char buffer[256][32];
if (mode != 0)
{
switch (mode)
{
case 1: // horizontal
for (register int x = 0; x < 256; x++)
for (register int y = 0; y < 256; y++)
setpixel(buffer, x, y, getpixel(imagemap, x, 255 - y));
break;
case 2: // vertical
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(buffer, x, y, getpixel(imagemap, 255 - x, y));
break;
}
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
setpixel(imagemap, x, y, getpixel(buffer, x, y));
}
}
int main(void)
{
static const int TCSIZE = 1;
static unsigned char data[TCSIZE][4096] = { 0 };
static unsigned char org[TCSIZE][4096] = { 0 };
static unsigned char result[TCSIZE][4096] = { 0 };
static unsigned char imagemap[TCSIZE][256][32] = { 0 };
srand(3); // The seed will be changed.
for (register int TC = 0; TC < TCSIZE; TC++)
for (register int c = 0; c < 4096; c++)
org[TC][c] = data[TC][c] = rand() % 15;
int PERFORMANCE = 10000;
time_t start = clock();
for (register int TC = 0; TC < TCSIZE; TC++)
encode(imagemap[TC], data[TC]);
PERFORMANCE -= (clock() - start) / (CLOCKS_PER_SEC / 1000);
for (register int TC = 0; TC < TCSIZE; TC++)
{
noise(imagemap[TC]);
rotate(imagemap[TC], rand() % 4);
flip(imagemap[TC], rand() % 3);
}
start = clock();
for (register int TC = 0; TC < TCSIZE; TC++)
decode(result[TC], imagemap[TC]);
PERFORMANCE -= (clock() - start) / (CLOCKS_PER_SEC / 1000);
int PASS = 0;
for (register int TC = 0; TC < TCSIZE; TC++)
if (memcmp(org[TC], result[TC], 4096) == 0) PASS++;
printf("SCORE: %d\n", PASS * 10000 + PERFORMANCE);
return 0;
}
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#include <stdio.h>
void set(unsigned char imagemap[256][32], int x, int y, int pixel)
{
unsigned char mask = 0x80 >> (x % 8);
if (pixel == 0) imagemap[y][x / 8] &= ~mask;
else imagemap[y][x / 8] |= mask;
}
int get(unsigned char imagemap[256][32], int x, int y)
{
unsigned char mask = 0x80 >> (x % 8);
if ((imagemap[y][x / 8] & mask) == 0) return 0;
else return 1;
}
void myrotate(unsigned char imagemap[256][32], int angle)
{
static unsigned char buffer[256][32];
if (angle != 0)
{
switch (angle)
{
case 1: // 90
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
set(buffer, x, y, get(imagemap, y, 255 - x));
break;
case 2: // 180
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
set(buffer, x, y, get(imagemap, 255 - x, 255 - y));
break;
case 3: // 270
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
set(buffer, x, y, get(imagemap, 255 - y, x));
break;
}
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
set(imagemap, x, y, get(buffer, x, y));
}
}
void myflip(unsigned char imagemap[256][32])
{
static unsigned char buffer[256][32];
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
set(buffer, x, y, get(imagemap, 255 - x, y));
for (register int y = 0; y < 256; y++)
for (register int x = 0; x < 256; x++)
set(imagemap, x, y, get(buffer, x, y));
}
int search(unsigned char imagemap[256][32])
{
int cnt[8] = { 0 }, pattern = 0, i, j, k;
int dy[8] = { 0, 129, 193, 64, 0, 129, 193, 64 }, dx[8] = { 64, 0, 129, 193, 129, 193, 64, 0 };
for (i = 0; i < 64; i += 2) for (j = 0; j < 64; j += 2) {
for (k = 0; k < 8; k++) cnt[k] += get(imagemap, j + dx[k], i + dy[k]);
}
/*
for (i = 0; i < 64; i += 2) for (j = 0; j < 64; j += 2) {
cnt[0] += get(imagemap, j + 64, i);
cnt[1] += get(imagemap, j, i + 129);
cnt[2] += get(imagemap, j + 129, i + 193);
cnt[3] += get(imagemap, j + 193, i + 64);
cnt[4] += get(imagemap, j + 129, i);
cnt[5] += get(imagemap, j + 193, i + 129);
cnt[6] += get(imagemap, j + 64, i + 193);
cnt[7] += get(imagemap, j, i + 64);
}*/
for (i = 1; i < 8; i++) if (cnt[pattern] < cnt[i]) pattern = i;
return pattern;
}
void output(unsigned char imagemap[256][32])
{
for (int i = 0; i < 256; i += 2) {
for (int j = 0; j < 256; j += 2) {
printf("%d", get(imagemap, j + j / 128, i + i / 128));
}
printf("\n");
}
printf("\n");
}
void encode(unsigned char imagemap[256][32], unsigned char data[4096])
{
int i, j, r, c, bit, y = 0, x = 0;
for (i = 0; i < 4096; i++) {
for (j = 3; j >= 0; j--) {
bit = (data[i] >> j) & 1;
for (r = 0; r < 2; r++) for (c = 0; c < 2; c++) set(imagemap, x + c, y + r, bit);
set(imagemap, x + x / 128, y + y / 128, 0);
x += 2;
if (x >= 256) x = 0, y += 2;
}
}
for (i = 0; i < 64; i += 2) for (j = 64; j < 128; j += 2) set(imagemap, j, i, 1);
//output(imagemap);
}
void decode(unsigned char data[4096], unsigned char imagemap[256][32])
{
//output(imagemap);
int pattern = search(imagemap);
if (pattern >= 4) myflip(imagemap);
myrotate(imagemap, pattern % 4);
int i, j, r, c, k = 0, cnt;
for (i = 0; i < 256; i += 2) for (j = 0; j < 256; j += 2) {
cnt = 0;
for (r = 0; r < 2; r++) for (c = 0; c < 2; c++)
cnt += get(imagemap, j + c, i + r);
cnt -= get(imagemap, j + j / 128, i + i / 128);
data[k / 4] = data[k / 4] * 2 + cnt / 2;
k++;
}
}
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