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Program.cpp
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Program.cpp
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#include<bits/stdc++.h>
using namespace std;
int magic[3][3] = {{2,7,6},{9,5,1},{4,3,8}};
bool gameWon(int game[3][3]){
//rows
for(int i=0;i<3;i++){
if((game[i][0]==game[i][1]) && (game[i][0]==game[i][2]) && (game[i][0]!=0))
return true;
}
//cols
for(int i=0;i<3;i++){
if((game[0][i]==game[1][i]) && (game[0][i]==game[2][i]) && (game[0][i]!=0))
return true;
}
//right dia
if((game[0][0]==game[1][1]) && (game[0][0]==game[2][2]) && game[0][0]!=0)
return true;
//left dia
if((game[0][2]==game[1][1]) && (game[0][2]==game[2][0]) && game[0][2]!=0)
return true;
return false;
}
void dispalyBoard(int game[3][3]){
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
if(game[i][j]==0)
cout<<" ";
if(game[i][j]==1)
cout<<"X";
if(game[i][j]==2)
cout<<"O";
if(j<2)
cout<<"|";
}
cout<<"\n";
if(i<2)
cout<<"- - -\n";
}
}
bool boardEmpty(int game[3][3]){
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
if(game[i][j]==0)
return true;
}
}
}
class gameBoard{
public: int b[3][3];
gameBoard(){
for(int i=0;i<3;i++)
for(int j=0;j<3;j++)
b[i][j]=0;
//b[0][1]=2;
}
};
int scCal(int game[3][3],int fill){
int count=0;
int temp[3][3];
int opp;
if(fill==1)
opp=2;
else opp=1;
for(int i=0;i<3;i++)
for(int j=0;j<3;j++)
temp[i][j] = game[i][j];
for(int i=0;i<3;i++)
for(int j=0;j<3;j++)
if(temp[i][j]==0)
temp[i][j]=fill;
//Rows Check
if( (temp[0][0]==fill || temp[0][1]==fill || temp[0][2]==fill) && (temp[0][0]!=opp && temp[0][1]!=opp && temp[0][2]!=opp) )
count++;
if( (temp[1][0]==fill || temp[1][1]==fill || temp[1][2]==fill) && (temp[1][0]!=opp && temp[1][1]!=opp && temp[1][2]!=opp))
count++;
if( (temp[2][0]==fill || temp[2][1]==fill || temp[2][2]==fill) && (temp[2][0]!=opp && temp[2][1]!=opp && temp[2][2]!=opp))
count++;
//Cols Check
if( (temp[0][0]==fill || temp[1][0]==fill || temp[2][0]==fill) && (temp[0][0]!=opp && temp[1][0]!=opp && temp[2][0]!=opp))
count++;
if( (temp[0][1]==fill || temp[1][1]==fill || temp[2][1]==fill) && (temp[0][1]!=opp && temp[1][1]!=opp && temp[2][1]!=opp))
count++;
if( (temp[0][2]==fill || temp[1][2]==fill || temp[2][2]==fill) && (temp[0][2]!=opp && temp[1][2]!=opp && temp[2][2]!=opp))
count++;
//Dias Check
if( (temp[0][0]==fill || temp[1][1]==fill || temp[2][2]==fill) && (temp[0][0]!=opp && temp[1][1]!=opp && temp[2][2]!=opp))
count++;
if( (temp[0][2]==fill || temp[1][1]==fill || temp[2][0]==fill) && (temp[0][2]!=opp && temp[1][1]!=opp && temp[2][0]!=opp))
count++;
return count;
}
int score(int game[3][3]){
int xScore,oScore;
xScore = scCal(game,1);
oScore = scCal(game,2);
return (oScore-xScore);
}
bool valid(int game[3][3],int x,int y){
if(game[x][y]==0)
return true;
cout<<"Invalid MOVE!!";
return false;
}
vector<pair<int, int> > get_available_moves(int game[3][3]) {
vector<pair<int, int> > available_moves;
for(int i = 0; i < 3; i++) {
for(int j = 0; j < 3; j++) {
if(game[i][j] == 0) {
available_moves.push_back(make_pair(i, j));
}
}
}
return available_moves;
}
int main(){
//int board[3][3] = {{0,0,0},{0,0,0},{0,0,0}};
//int board[3][3] = {{3,2,1},{5,1,6},{1,9,1}};
gameBoard board;
int x,y;
bool player;
//Computer = 2(0)
//Player = 1(X)
//Blank = 0(-)
while(boardEmpty(board.b)){
//*********Players turn*********
cout << "Current Board Status\n\n" << endl;
dispalyBoard(board.b);
cout<<"\n\n\n";
do{
vector<pair<int, int> > available_moves = get_available_moves(board.b);
cout<<"Enter your move : (available moves: ";
for(int i = 0; i < available_moves.size(); i++) {
if (i != 0) {
cout << ", ";
}
cout << available_moves[i].first << " " << available_moves[i].second;
//printf("oay");
}
cout << ")" << endl;
cin>>x>>y;
}while(!valid(board.b,x,y));
player=true;
board.b[x][y]=1;
if(gameWon(board.b)&&player){
dispalyBoard(board.b);
cout<<"\nPlayer won!!\n";
string play_again = "";
cout << "play_again?(Yes/No)" <<endl;
cin >> play_again;
if(play_again == "Yes" || play_again == "YES" || play_again == "yes") {
for(int i = 0; i < 3; i++) {
for(int j = 0; j < 3; j++) {
board.b[i][j] = 0;
}
}
cout<<"\n\n\n";
continue;
}
else {
break;
}
}
player=false;
//********Computer's turn********
//********** MAX PLY BEGINS ***********
pair< pair<int,int> ,int > p[8];
int pairCount=0;
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
if(board.b[i][j]==0){
board.b[i][j]=2;
if(gameWon(board.b)){
p[pairCount++] = make_pair(make_pair(i,j),INT_MAX);
}
else{
//*********** MIN PLY BEGINS *********
int minScore = INT_MAX;
pair<int,int> bestPair;
for(int k=0;k<3;k++){
for(int l=0;l<3;l++){
if(board.b[k][l]==0){
board.b[k][l]=1;
//**** Calculate score begins****
int sc;
if(gameWon(board.b)){
sc = INT_MIN;
}
else{
sc = score(board.b);
}
if(sc<minScore)
minScore = sc;
//****Calculate score ends*****
board.b[k][l]=0;
}
}
}
p[pairCount++] = make_pair(make_pair(i,j),minScore);
//********** MIN PLY ENDS **********
}
//reseting
board.b[i][j]=0;
}
}
}
//************* MAX PLY ENDS *************
pair<int, int> bestMove;
int maxScore = INT_MIN;
for(int c=0;c<pairCount;c++){
if(p[c].second>=maxScore){
bestMove = p[c].first;
//cout<<"next best move";
maxScore = p[c].second;
}
cout<<"i="<<p[c].first.first<<" j="<<p[c].first.second<<" score="<<p[c].second<<"\n";
}
board.b[bestMove.first][bestMove.second]=2;
//*****check if computer won*****
if(gameWon(board.b)&&!player){
dispalyBoard(board.b);
cout<<"\nComputer won!!\n";
string play_again = "";
cout << "play_again?(Yes/No)" <<endl;
cin >> play_again;
if(play_again == "Yes" || play_again == "YES" || play_again == "yes") {
for(int i = 0; i < 3; i++) {
for(int j = 0; j < 3; j++) {
board.b[i][j] = 0;
}
}
cout<<"\n\n\n";
continue;
}
else {
break;
}
}
}
}