## Google Interview Question for Software Engineers

Country: United States
Interview Type: In-Person

Comment hidden because of low score. Click to expand.
2
of 2 vote

``````//input a 4X13 matrix with 4 suits and 13 ranks of cards. set cards[suit][rank] to 1 if this card in hand.
public static boolean handClear(int[][] cards, int hand) {

if(hand == 0) return true;

for(int rank = 12; rank >= 0; rank--) {

for(int suit = 0; suit < 4; suit++) {

if(cards[suit][rank] == 1) { //if cards[suit][rank] in hand

cards[suit][rank] = 0; hand--;

int smallerRank = rank == 0 ? 12: rank - 1; // look for straight flush that end with this card
// watch for Ace as a special case that ***QKA and A23*** both valid
if(cards[suit][smallerRank] == 1) {

cards[suit][smallerRank] = 0; hand--;

int r = smallerRank - 1;

for(; r >= 0 && cards[suit][r] == 1; r--) {   //try playing the straight flush found

cards[suit][r] = 0; hand--;

if(handClear(cards, hand)) return true;

}

r++;

for(; r <= smallerRank; r++) {  //backtrack if play did not work

cards[suit][r] = 1; hand++;

}

}
//look for 3/4 of a kind for cards[suit][rand]
int n = cards[0][rank] + cards[1][rank] + cards[2][rank] + cards[3][rank];

if(n == 3 || n == 2) {

int tmp1 = cards[(suit + 1) % 4][rank],
tmp2 = cards[(suit + 2) % 4][rank],
tmp3 = cards[(suit + 3) % 4][rank];

cards[(suit + 1) % 4][rank] = 0; //try playing the 3/4 of a kind
cards[(suit + 2) % 4][rank] = 0;
cards[(suit + 3) % 4][rank] = 0;
hand -= n;

if(handClear(cards, hand)) return true;

cards[(suit + 1) % 4][rank] = tmp1;   //backtrack if play did not work
cards[(suit + 2) % 4][rank] = tmp2;
cards[(suit + 3) % 4][rank] = tmp3;
hand += n;

}

cards[suit][rank] = 1; hand++;
}
}
}
return false;

}``````

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Comment hidden because of low score. Click to expand.
0
of 0 vote

``````#include<iostream>
using namespace std;
int main() {
bool pack[4][13] = {{0,0}};
bool play=false;
int pack_type=0,number = 0,cnt=0;

cout<<"\nEnter pack_type (1-spade, 2-diamond, 3-heart, 4-club (0 for break):"; cin>>pack_type;
cout<<"Enter number (Ace-1, 2-2,3-3..., J-11, Q-12, K-13 (0 for break):"; cin>> number;

while (pack_type !=0 && number !=0) {
if(pack_type <1 || pack_type>4 || number<1 ||number >13)
return -1;
if (pack[pack_type-1][number-1]==true) {
cout<<"Dup entry";
return -1;
}
pack[pack_type-1][number-1]=true;
cnt++;
cout<<"\nEnter pack_type (1-spade, 2-diamond, 3-heart, 4-club (0 for break):"; cin>>pack_type;
cout<<"Enter number (Ace-1, 2-2,3-3..., J-11, Q-12, K-13 (0 for break):"; cin>> number;
}

if(cnt<3) cout<<"Can't play!!";

for(int i=0;i<4;i++) {
for (int j=0;j<11;j++) {
if (pack[i][j] && pack[i][j+1] && pack[i][j+2]) {
cout<<"Trace1: I can continue to play!!";
printf("Combo :\n %d->%d \n %d->%d \n%d->%d \n",i+1,j+1,i+1,j+2,i+1,j+3);
play=true;
break;
}
}
if(play) {
return 0;
}
}

for(int i=0;i<2;i++) {
for (int j=0;j<13;j++) {
if(pack[i][j] &&pack[i+1][j] &&pack[i+2][j]) {
cout<<"Trace 2:I can continue to play!!";
printf("Combo :\n %d->%d \n %d->%d \n%d->%d \n",i+1,j+1,i+2,j+1,i+3,j+1);
play=true;
break;
}
}
if(play) {
return 0;
}
}
for(int i=0;i<4;i++) {
for (int j=0;j<11;j++) {
cout<<pack[i][j];
}
cout<<'\n';
}
cout<<"I cannot continue to play!!";
return -1;
}``````

Comment hidden because of low score. Click to expand.
0
of 0 vote

In first example why it returned false when it had 3 qs or even a flush of 3 AKQ

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