2011ACM/ICPC亚洲区大连现场赛：F Draw a Mess [zoj 3544 Draw a Mess]

F Draw a Mess (ZJU 3544)。

悲催的大连现场赛。

看了大牛的解题报告，用一个有点像并查集的东西实现涂色。

画三角形的时候理解错误，其实三角形的底是在Y轴上的。。。

vim，gcc，g++挺好用的~

/* zoj 3544 Draw a Mess */#include <stdio.h>#include <string.h>#include <math.h>#define MAXN 200#define MAXM 50000inline int abs(int a) { return a>=0?a:-a;}inline int min(int a, int b) { return a<b?a:b;}inline int max(int a, int b) { return a>b?a:b;}struct Line {int f[MAXM+1], c[MAXM+1];void init(int m) {int i;for (i = 0; i <= m; i++) f[i] = -1, c[i] = 0;}int find(int x) {if (f[x] == -1 || x == f[x]) return x;return f[x] = find(f[x]); }};Line line[MAXN+1];struct Paint{int xc, yc, r, c, l, w;char type;};Paint pt[50000];int color[10];void init(int n, int m){int i, j;for (i = 0; i < n; ++i) line[i].init(m);}void draw_line(int x, int y1, int y2, int c){int i, a, b;for (a = y1; a <= y2; ++a) {if (line[x].f[a] != -1) {a = line[x].find(a);continue;}for (b = a; b <= y2; ++b) {if (line[x].f[b] != -1) break;}--b;for (i = a; i <= b; i++) line[x].f[i] = b;line[x].c[b] = c;color[c] += b - a  + 1;a = b;}}int main(){int i, x, x_st, x_ed, y1, y2, dx, dy, tmp;int n, m, q, b;char str[256];while (3 == scanf("%d %d %d", &n, &m, &q)) {init(n, m);memset(color, 0, sizeof(color));for (i = 0; i < q; ++i) {scanf("%s", str);pt[i].type = str[0];if (str[0] == 'C') // Circlescanf("%d %d %d %d", &pt[i].xc, &pt[i].yc, &pt[i].r, &pt[i].c);else if (str[0] == 'D') // Diamondscanf("%d %d %d %d", &pt[i].xc, &pt[i].yc, &pt[i].r, &pt[i].c);else if (str[0] == 'R') // Rectanglescanf("%d %d %d %d %d", &pt[i].xc, &pt[i].yc, &pt[i].l, &pt[i].w, &pt[i].c);else if (str[0] == 'T') // Trianglescanf("%d %d %d %d", &pt[i].xc, &pt[i].yc, &pt[i].w, &pt[i].c);}for (i = q-1; i >= 0; --i) {if (pt[i].type == 'C') {  /// Circlex_st = max(pt[i].xc - pt[i].r, 0);x_ed = min(pt[i].xc + pt[i].r, n-1);for (x = x_st; x <= x_ed; ++x) {dx = abs(pt[i].xc - x);tmp = pt[i].r*pt[i].r - dx*dx;if (tmp < 0) continue;dy = (int)sqrt(tmp);y1 = pt[i].yc - dy;if (y1 < 0) y1 = 0;y2 = pt[i].yc + dy;if (y2 > m-1) y2 = m-1;draw_line(x, y1, y2, pt[i].c);}}else if (pt[i].type == 'D') { /// Diamondx_st = max(pt[i].xc - pt[i].r, 0);x_ed = min(pt[i].xc + pt[i].r, n-1);for (x = x_st; x <= x_ed; ++x) {dy = pt[i].r - abs(pt[i].xc  - x);y1 = pt[i].yc - dy;if (y1 < 0) y1 = 0;y2 = pt[i].yc + dy;if (y2 > m-1) y2 = m-1;draw_line(x, y1, y2, pt[i].c);}}else if (pt[i].type == 'R') { /// Rectanglex_st = pt[i].xc;x_ed = min(pt[i].xc + pt[i].l - 1, n-1);y1 = pt[i].yc;y2 = min(pt[i].yc + pt[i].w - 1, m-1);for (x = x_st; x <= x_ed; ++x) {draw_line(x, y1, y2, pt[i].c);}}else if (pt[i].type == 'T') { /// Triangle /*x_st = max(pt[i].xc - pt[i].w / 2, 0);x_ed = min(pt[i].xc + pt[i].w / 2, n-1);y1 = pt[i].yc;for (x = x_st; x <= x_ed; ++x) {if (x <= pt[i].xc) dy = x - (pt[i].xc - pt[i].w / 2);else dy = (pt[i].xc + pt[i].w / 2) - x;y2 = y1 + dy;if (y2 > m - 1) y2 = m - 1;draw_line(x, y1, y2, pt[i].c);} */x_st = pt[i].xc;x_ed = min(pt[i].xc + pt[i].w  / 2, n-1);for (x = x_st; x <= x_ed; ++x) {dy = (pt[i].w - (x - pt[i].xc)*2)/2;y1 = max(pt[i].yc - dy, 0);y2 = min(pt[i].yc + dy, m-1);draw_line(x, y1, y2, pt[i].c);}}}for (i = 1; i < 9; ++i) printf("%d ", color[i]);printf("%d\n", color[9]);}return 0;}