From a4fc2530e30c2612c58463a94c23bde7dcaf7d8f Mon Sep 17 00:00:00 2001
From: Daniel Saad <daniel.saad.nunes@gmail.com>
Date: Fri, 8 May 2026 15:18:32 -0300
Subject: [PATCH] adding solution with constant heap time

---
 ra-preguicosa/src/ac_constant_time_heap.c | 184 ++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 ra-preguicosa/src/ac_constant_time_heap.c

diff --git a/ra-preguicosa/src/ac_constant_time_heap.c b/ra-preguicosa/src/ac_constant_time_heap.c
new file mode 100644
index 0000000..47616c7
--- /dev/null
+++ b/ra-preguicosa/src/ac_constant_time_heap.c
@@ -0,0 +1,184 @@
+#include <stdio.h>
+#include <string.h>
+#define INF 0x3f3f3f3f
+#define MAX 150000
+typedef struct node_t{
+	int i;
+	int j;
+	int c;
+}node_t;
+
+/*pantano*/
+char mesh[1001][1001];
+int custo[1002][1002];
+char calculado[1002][1002];
+int inserido[1002][1002];
+node_t filas[8][MAX];
+int contadoresInicio[8];
+int contadoresFim[8];
+int C,R;
+int Cf,Rf,Ct,Rt;
+int C1,R1,C2,R2;
+int W;
+int currentFila;
+
+/*Escova bit*/
+inline int get_int(){
+   int ch, i;
+   while (((ch = getchar()) == ' ') || (ch == '\n'));
+   for (i = 0; ch >= '0' && ch <= '9'; ch = getchar() )
+       i = 10 * i + (ch - '0');
+	return i;
+}
+
+
+void insere(node_t no,int custo){
+	int balde = custo%8;
+	inserido[no.i][no.j] = balde;
+	filas[balde][contadoresFim[balde]++] = no;
+}
+
+int retira(node_t* aux){
+	int start = currentFila;
+	while(contadoresInicio[currentFila]==contadoresFim[currentFila]){
+		currentFila++;
+		if(currentFila==8) currentFila = 0;
+		if(currentFila==start) return(0);
+	}
+	*aux = filas[currentFila][contadoresInicio[currentFila]++];
+	return(1);
+}
+
+/*Funcao q testa os limites do tabuleiro e outras coisas
+ *do Dijkstra
+ */
+int testa(node_t current,int i,int j,int c){
+
+	int custoAtual = custo[current.i][current.j];
+	node_t temp;
+	if(!(i<=R && i>=1 && j<=C && j>=1)){
+		return(1);
+	}
+
+	if(calculado[i][j]){
+		return(1);
+	}
+	if(mesh[i][j]==0){
+		/*relaxamento*/
+		if(custoAtual+c < custo[i][j]){
+			custo[i][j] = custoAtual+c;
+			/*insere normal*/
+			temp.i = i;
+			temp.j = j;
+			temp.c = custo[i][j];
+			insere(temp,(custo[i][j]));
+		}
+		return(1);
+	}
+	return(0);
+}
+
+
+int getFila(){
+	int i;
+	for(i=0;i<8;i++){
+		if(contadoresInicio[i]<contadoresFim[i]){
+			return(i);
+		}
+	}
+	return(8);
+}
+
+int main(void){
+	int i,j,k;
+	node_t aux;
+	node_t sapo;
+	while(C=get_int(),R=get_int(),C||R){
+		memset(mesh,0,sizeof(char)*1001*1001);
+		memset(custo,0x3f,sizeof(int)*1002*1002);
+		//~ memset(calculado,0,sizeof(char)*1002*1002);
+		//~ memset(inserido,-1,sizeof(int)*1002*1002);/*nenhum nó foi inserido ainda*/
+		memset(contadoresInicio,0,sizeof(contadoresInicio));
+		memset(contadoresFim,0,sizeof(contadoresFim));
+		Cf = get_int();
+		Rf = get_int();
+		Ct = get_int();
+		Rt = get_int();
+		W = get_int();
+		for(k=0;k<W;k++){
+			C1 = get_int();
+			R1 = get_int();
+			C2 = get_int();
+			R2 = get_int();
+			for(i=R1;i<=R2;i++){
+				for(j=C1;j<=C2;j++){
+					mesh[i][j] = 1;/*alagado*/
+				}
+			}
+		}
+		sapo.i = Rf; sapo.j = Cf;
+		custo[sapo.i][sapo.j] = 0;
+		insere(sapo,0);
+		currentFila = 0;
+		while(retira(&aux)){
+			if(aux.c > custo[aux.i][aux.j]) continue;
+			/*pega a frente de onda*/
+			//~ calculado[aux.i][aux.j] = 1;
+
+			/*Só faz sentido calcular o pulo mais distante
+			 *de o pulo da frente tiver alagado
+			 */
+
+			/*Superior*/
+			if(!testa(aux,aux.i+1,aux.j,2))
+				testa(aux,aux.i+2,aux.j,5);
+
+			/*Diagonais*/
+			if(!testa(aux,aux.i+1,aux.j-1,3)){
+				testa(aux,aux.i+2,aux.j-2,7);
+				testa(aux,aux.i+2,aux.j-1,6);
+				testa(aux,aux.i+1,aux.j-2,6);
+			}
+
+			/*Diagonais*/
+			if(!testa(aux,aux.i+1,aux.j+1,3)){
+				testa(aux,aux.i+2,aux.j+2,7);
+				testa(aux,aux.i+2,aux.j+1,6);
+				testa(aux,aux.i+1,aux.j+2,6);
+			}
+
+			/*parte lateral*/
+
+			if(!testa(aux,aux.i,aux.j-1,2))
+				testa(aux,aux.i,aux.j-2,5);
+			if(!testa(aux,aux.i,aux.j+1,2))
+				testa(aux,aux.i,aux.j+2,5);
+
+			/*parte de baixo*/
+			if(!testa(aux,aux.i-1,aux.j,2))
+				testa(aux,aux.i-2,aux.j,5);
+			/*Diagonais*/
+			if(!testa(aux,aux.i-1,aux.j-1,3)){
+				testa(aux,aux.i-2,aux.j-2,7);
+				testa(aux,aux.i-1,aux.j-2,6);
+				testa(aux,aux.i-2,aux.j-1,6);
+			}
+
+			/*Diagonais*/
+			if(!testa(aux,aux.i-1,aux.j+1,3)){
+				testa(aux,aux.i-2,aux.j+2,7);
+				testa(aux,aux.i-2,aux.j+1,6);
+				testa(aux,aux.i-1,aux.j+2,6);
+			}
+
+		}
+		if(custo[Rt][Ct]==INF){
+			printf("impossible\n");
+		}
+		else{
+			printf("%d\n",custo[Rt][Ct]);
+		}
+	}
+	return(0);
+}
+