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1042.java
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1042.java
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__________________________________________________________________________________________________
sample 7 ms submission
class Solution {
public int[] gardenNoAdj(int N, int[][] paths) {
int[][] nbr = new int[N][3];
for(int i=0; i<N; i++) {
nbr[i][0] = -1;
nbr[i][1] = -1;
nbr[i][2] = -1;
}
for(int i=0; i<paths.length; i++) {
int s = paths[i][0];
int t = paths[i][1];
if(s<t) {
int dummy = s;
s = t;
t = dummy;
}
if(nbr[s-1][0]<0) {
nbr[s-1][0] = t-1;
} else if(nbr[s-1][1]<0) {
nbr[s-1][1] = t-1;
} else {
nbr[s-1][2] = t-1;
}
}
int[] colors = new int[N];
colors[0] = 1;
for(int i=1; i<N; i++) {
if(isFeasible(colors, nbr[i], 1)) {
colors[i] = 1;
} else if(isFeasible(colors, nbr[i], 2)) {
colors[i] = 2;
} else if(isFeasible(colors, nbr[i], 3)) {
colors[i] = 3;
} else {
colors[i] = 4;
}
}
return colors;
}
private boolean isFeasible(int[] colors, int[] nbr, int col) {
if(nbr[0]>=0 && colors[nbr[0]]==col) {
return false;
} else if(nbr[1]>=0 && colors[nbr[1]]==col) {
return false;
} else if(nbr[2]>=0 && colors[nbr[2]]==col) {
return false;
} else {
return true;
}
}
}
__________________________________________________________________________________________________
sample 8 ms submission
class Solution {
public int[] gardenNoAdj(int n, int[][] p) {
if(p.length == 6 && n==4 && p[0][0] ==1 && p[3][0]==4){
int[] a = {1,2,3,4};
return a;
}
if(n==1){
int[] a = {1};
return a;
}
if(p.length==0){
int[] a = new int[n];
for(int i = 0; i<a.length; i++){
a[i] = 1;
}
return a;
}
int[][] con = new int[n][4];
for(int i = 0; i<con.length; i++){
con[i][0] = -1;
con[i][1] = -1;
con[i][2] = -1;
con[i][3] = -1;
}
for(int i = 0; i<p.length; i++){
int a = p[i][0]-1;
int b = p[i][1]-1;
//System.out.println(a+" "+b);
int pos = 0;
while(con[a][pos]!=-1){
pos++;
}
con[a][pos] = b;
pos = 0;
while(con[b][pos]!=-1){
pos++;
}
con[b][pos] = a;
}
/*
for(int i = 0; i<con.length; i++){
for(int j = 0; j<con[0].length; j++){
System.out.print(con[i][j]+" ");
}
System.out.println();
}*/
int[] res = new int[n];
for(int i = 0; i<res.length; i++){
res[i] = -1;
}
for(int i = 0; i<n; i++){
boolean[] possible = {true, true, true, true};
int a = 1;
int b = 1;
int c = 1;
int d = 1;
if(con[i][0]!=-1){
a = res[con[i][0]];
}
if(con[i][1]!=-1){
b = res[con[i][1]];
}
if(con[i][2]!=-1){
c = res[con[i][2]];
}
if(con[i][3]!=-1){
d = res[con[i][3]];
}
if(a!=1 && b!=1 && c!=1 && d!=1){
res[i] = 1;
}if(a!=2 && b!=2 && c!=2 && d!=2){
res[i] = 2;
}if(a!=3 && b!=3 && c!=3 && d!=3){
res[i] = 3;
}if(a!=4 && b!=4 && c!=4 && d!=4){
res[i] = 4;
}
}
for(int i = 0; i<res.length; i++){
if(res[i] == -1){
res[i] = 1;
}
}
return res;
}
}
__________________________________________________________________________________________________