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Sombit Bose 2020-04-29 22:49:20 +05:30 committed by GitHub
parent c76eb387ac
commit e742280a87
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1 changed files with 18 additions and 19 deletions
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37
backtracking/n_queens_all_solution_optimised.cpp
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@ -1,27 +1,27 @@
#include <iostream>
#define n 4
#define inc_loop(var, start, stop, step) for (int var=start; var <= stop; var+=step)
#define dec_loop(var, start, stop, step) for (int var=start; var >= stop; var-=step)
#define inc_loop(var, start, stop) for (int var=start; var <= stop; var++)
#define dec_loop(var, start, stop) for (int var=start; var >= stop; var--)
void PrintSol(int Board[n][n]) {
inc_loop(i,0,n-1,1) {
inc_loop(j,0,n-1,1)
inc_loop(i,0,n-1) {
inc_loop(j,0,n-1)
std::cout << Board[i][j] << " ";
std::cout << std::endl;
}
std::cout << std::endl;
if (n%2==0 || (n%2==1 && Board[n/2+1][0]!=1)){
inc_loop(i,0,n-1,1){
dec_loop(j,n-1,0,1)
std::cout<<Board[i][j]<<" ";
std::cout<<std::endl;
if (n%2 == 0 || (n%2 == 1 && Board[n/2+1][0] != 1)){
inc_loop(i,0,n-1){
dec_loop(j,n-1,0)
std::cout << Board[i][j] << " ";
std::cout << std::endl;
}
std::cout<<std::endl;
std::cout << std::endl;
}
}
bool CanIMove(int Board[n][n], int row, int col) {
/// check in the row
for (int i = 0; i < col; i++) {
inc_loop (i, 0, col-1) {
if (Board[row][i] == 1)
return false;
}
@ -54,20 +54,19 @@ void NQueenSol(int Board[n][n], int col) {
int main() {
int Board[n][n] = {0};
if (n%2==0) {
inc_loop(i,0,n/2-1,1) {
if (n%2 == 0) {
inc_loop(i, 0, n/2-1) {
if (CanIMove(Board, i, 0)) {
Board[i][0] = 1;
NQueenSol(Board,1);
NQueenSol(Board, 1);
Board[i][0] = 0;
}
}
}
else {
inc_loop(i,0,n/2,1) {
if (CanIMove(Board, i,0)) {
} else {
inc_loop(i, 0, n/2) {
if (CanIMove(Board, i, 0)) {
Board[i][0] = 1;
NQueenSol(Board,1);
NQueenSol(Board, 1);
Board[i][0] = 0;
}
}