Submission #57282

#	Time	Username	Problem	Language	Result	Execution time	Memory
57282		fredbr	Land of the Rainbow Gold (APIO17_rainbow)	C++17	0 / 100	34 ms	1280 KiB

rainbow

#include <bits/stdc++.h>
#include "rainbow.h"

using namespace std;

const int maxn = 110;
const int maxm = 202020;
int r, c;
char riv[maxn][maxm];
char vis[maxn][maxm];
int pini[3][maxn], pfim[3][maxn];

int soma1 = 0, soma2 = 0;

int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};

void dfs(int x, int y, int x1, int y1, int x2, int y2)
{
	vis[x][y] = 1;
	for (int i = 0; i < 4; i++) {

		int xx = x+dx[i];
		int yy = y+dy[i];
		if (xx < x1 or xx > x2 or yy < y1 or yy > y2) continue;
		if (riv[xx][yy] or vis[xx][yy]) continue;
		dfs(xx, yy, x1, y1, x2, y2);
	}
}

void init2()
{
	for (int i = 1; i <= c; i++) {

		if (!riv[1][i] and (i == 1 or riv[1][i-1]))
			pini[1][i]++;
		if (!riv[2][i] and (i == 1 or riv[2][i-1]))
			pini[2][i]++;
		if (!riv[1][i] and (i==c or riv[1][i+1]))
			pfim[1][i]++;
		if (!riv[2][i] and (i==c or riv[2][i+1]))
			pfim[2][i]++;

		if ((pini[1][i] and pini[2][i]) or
		    ((riv[1][i]^riv[2][i]) and (pini[1][i]|pini[2][i])))
			pini[0][i]++;

		if ((pfim[1] and pfim[2][i]) or
		    ((riv[1][i]^riv[2][i]) and (pfim[1][i]|pfim[2][i])))
		    pfim[0][i]++;

		pini[1][i] += pini[1][i-1];			
		pini[2][i] += pini[2][i-1];
		pfim[1][i] += pfim[1][i-1];	
		pfim[2][i] += pfim[2][i-1];
		pini[0][i] += pini[0][i-1];	
		pfim[0][i] += pfim[0][i-1];
	}
}

void init(int rr, int cc, int sr, int sc, int m, char* s)
{
	r = rr, c = cc;

	int x = sr, y = sc;
	riv[x][y] = 1;
	for (int i = 0; i < m; i++) {

		if (s[i] == 'N') x--;
		else if (s[i] == 'E') y++;
		else if (s[i] == 'S') x++;
		else y--;
		riv[x][y] = 1;
	}

	if (r == 2)
		init2();
}

int colour1(int x1, int y1, int x2, int y2)
{
	int ans = 0;

	for (int i = x1; i <= x2; i++)
		for (int j = y1; j <= y2; j++)
			vis[i][j] = 0;
	for (int i = x1; i <= x2; i++)
		for (int j = y1; j <= y2; j++)
			if (!riv[i][j] and !vis[i][j])
				dfs(i, j, x1, y1, x2, y2), ans++;

	return ans;
}

int colour2(int x1, int y1, int x2, int y2)
{
	if (y2 == 1) {

		int ans = pini[1][x2] - pfim[1][x1-1];
		return ans;
	}
	if (y1 == 2) {
		int ans = pini[2][x2] - pfim[2][x1-1];
		return ans;
	}
	return pini[0][x2]-pfim[0][x1-1];
}

int colour(int x1, int y1, int x2, int y2)
{
	if (r == 2)
		return colour2(x1, y1, x2, y2);
	else return colour1(x1, y1, x2, y2);
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 12
• Subtask 3: 0 / 24
• Subtask 4: 0 / 27
• Subtask 5: 0 / 26