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第16回オフラインリアルタイムどう書くの参考問題をC言語で実装

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問題内容等についてはこちら。
http://nabetani.sakura.ne.jp/hena/ord16lcove/

ビットマップデータにしました。

#include <stdio.h>

#define WIDTH  (10)
#define HEIGHT (10)
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
#define swap(type, a, b) {type t = (a); (a) = (b); (b) = t;}

void reverseX(int *m, int w, int h)
{   /* m[y] is bitmap data of x */
    int x, y, r;
    for (y = 0; y < h; y++) {
        r = 0;
        for (x = 0; x < w; x++) r = (r << 1) | ((m[y] >> x) & 1);
        m[y] = r;
    }
}

void reverseY(int *m, int h)
{
    int y = h / 2;
    while (--y >= 0) swap(int, m[y], m[h - 1 - y]);
}

int cut(int *m, int w, int h)
{   /* search a maximum rectangle area on 0 at the left upper corner */
    int area = 0, x = w, y;
    for (y = 0; y < h; y++) {
        if (m[y] & ((1 << x) - 1)) {
            area = max(area, x * y);
            while (m[y] & ((1 << x) - 1)) x--;
        }
    }
    return area;
}

int solve(char *data)
{
    int m[HEIGHT] = {0}, x, y, w, h, area, c;
    int min_x = WIDTH, min_y = HEIGHT, max_x = 0, max_y = 0;
    for (; *data; data++) {
        if (isdigit(*data)) {
            x = *data - '0'; y = *++data - '0';
            m[y] |= 1 << x;
            min_x = min(min_x, x); min_y = min(min_y, y);
            max_x = max(max_x, x); max_y = max(max_y, y);
        }
    }
    w = max_x - min_x + 1; h = max_y - min_y + 1;
    area = w * h;
    if (area == 1) return 3;
    for (y = 0; y < h; y++) m[y] = m[y + min_y] >> min_x; /* move origin */
    c = cut(m, w, h);                              /* upper left  corner */
    reverseY(m,    h); c = max(c, cut(m, w, h));   /* lower left  corner */
    reverseX(m, w, h); c = max(c, cut(m, w, h));   /* lower right corner */
    reverseY(m,    h); c = max(c, cut(m, w, h));   /* upper right corner */
    return c > 0 ? area - c : area < WIDTH * HEIGHT ? area + 1 : 0;
}

void test(char *data, char *correct)
{
    int answer = solve(data);
    printf("%s %d %s %s\n", answer==atoi(correct)?"OK":"NG", answer, correct, data);
}

int main()
{
    /*0*/ test( "41,33,26,55,74,58,68", "39" );
    /*1*/ test( "00,99,09,90", "-" );
    /*2*/ test( "09", "3" );
    /*3*/ test( "05,05,05", "3" );
    /*4*/ test( "45", "3" );
    /*5*/ test( "38,39", "3" );
    /*6*/ test( "38,47", "3" );
    /*7*/ test( "45,66", "4" );
    /*8*/ test( "12,34,56,78", "33" );
    /*9*/ test( "12,34,56,78,45", "37" );
    /*10*/ test( "00,09,00", "11" );
    /*11*/ test( "00,90", "11" );
    /*12*/ test( "99,09", "11" );
    /*13*/ test( "99,90", "11" );
    /*14*/ test( "11,12,21,22", "5" );
    /*15*/ test( "42,45,92,95,83,62", "25" );
    /*16*/ test( "42,45,92,83,62", "14" );
    /*17*/ test( "34,38,78,74,56,35,77,48,54", "26" );
    /*18*/ test( "38,78,74,56,35,77,48,54", "23" );
    /*19*/ test( "31,41,21,71,21", "7" );
    /*20*/ test( "46,45,42,44,45", "6" );
    /*21*/ test( "00,99,09", "19" );
    /*22*/ test( "99,09,90,24", "64" );
    /*23*/ test( "99,16,61,34,17,24,42,26,18,71,19,91,81,43,33,62,52,25", "75" );
    /*24*/ test( "55,43,16,91,61,19,24,18,33,34,71,81,42,62,52,26,17,25", "53" );
    /*25*/ test( "71,26,81,62,17,16,25,42,33,52,19,18,91,24,61,34,43", "45" );  
    /*26*/ test( "39,49,19,93,78,58,48,91,95,29,68,92,86,87,94,77", "39" );
    /*27*/ test( "69,89,25,26,58,12,37,36,68,24,11,13,48,14,79", "37" );
    /*28*/ test( "58,67,92,38,83,29,91,76,84,57,75,48,85,19,66", "51" );
    /*29*/ test( "00,83,76,85,48,19,75,29,92,57,66,67,91,58,38,84", "91" );
    /*30*/ test( "11,92,57,38,58,66,91,67,84,48,83,19,75,85,76,29", "72" );
    /*31*/ test( "36,07,45", "9" );
    /*32*/ test( "57,23,24,74", "21" );
    /*33*/ test( "92,20,32,12,65", "39" );
    /*34*/ test( "24,54,66,48,54,15", "21" );
    /*35*/ test( "05,17,42,20,48,22,13", "39" );
    /*36*/ test( "53,84,55,56,25,14,84,43", "26" );
    /*37*/ test( "06,77,56,59,15,24,09,66,71", "51" );
    /*38*/ test( "53,36,47,45,45,67,66,46,63,75", "21" );
    /*39*/ test( "35,53,93,33,02,84,83,48,54,32,28", "50" );
    /*40*/ test( "55,74,32,84,41,64,24,44,15,14,26,53", "39" );
    /*41*/ test( "47,60,34,32,19,67,24,83,94,38,47,05,79", "88" );
    /*42*/ test( "63,32,42,74,66,64,35,41,74,25,48,62,44,54", "42" );
    /*43*/ test( "00,86,16,19,09,92,51,10,68,23,14,63,21,46,03", "91" );
    /*44*/ test( "56,46,54,14,15,25,53,84,58,85,44,37,54,76,26,76", "42" );
    /*45*/ test( "71,87,39,43,76,38,91,69,98,33,43,26,56,69,73,52,89", "66" );  
    /*46*/ test( "43,26,84,64,52,48,36,23,66,53,41,57,76,36,84,57,35,41", "47" );
    /*47*/ test( "81,02,85,93,36,46,80,27,72,28,02,99,13,41,36,40,18,97,38", "91" );
    /*48*/ test( "63,46,75,58,42,26,58,37,14,75,35,63,32,36,52,46,85,14,48,23", "47" );
    /*49*/ test( "66,92,64,12,17,33,10,28,75,05,81,05,42,86,52,57,56,78,87,81,10", "82" );
    /*50*/ test( "48,25,58,76,15,74,43,44,24,62,33,67,34,34,42,48,37,33,51,43,46,67", "50" );
    return 0;
}
shiracamus
元、低レイヤーエンジニア。 現、サイバーセキュリティ研究者。 使用言語は、C, Lisp, Java, Python, C#, JavaScript/Node.js。 経験アセンブリ言語は Z80, 6502, 6809, 68000, SPARC, PowerPC, ARM, x86/x64。
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