1 bình luận cho Algorithms-K58-PM: Đệ quy – Quay lui – Nhánh cận

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  06/10/2020 - 14:34

  admin  says:

  #include <iostream> using namespace std; const int MAX = 100; int a[MAX], n = 20, dem = 0; // in phuong an xep hau void print() { dem++; cout << "Phuong an thu " << dem << ":" << endl; for (int i = 1; i <= n; i++, cout << endl) for (int j = 1; j <= n; j++) if (j == a[i]) cout << " x"; else cout << " ."; } bool check(int h, int c) { // kiem tra cot for (int i = 1; i < h; i++) if (c == a[i]) return false; // kiem tra duong cheo chinh for (int i = 1; i < h; i++) if (c-h == a[i]-i) return false; // kiem tra duong cheo chinh for (int i = 1; i < h; i++) if (c+h == a[i]+i) return false; return true; } // dat quan hau o dong thu k void dat(int k) { if (k > n) { print(); return; } for (int i = 1; i <= n; i++) if (check(k, i)) { a[k] = i; dat(k+1); } } int main() { dat(1); } </iostream>

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  #include <iostream> using namespace std;   const int MAX = 100;   int a[MAX], n = 20, dem = 0;   // in phuong an xep hau void print() { dem++; cout << "Phuong an thu " << dem << ":" << endl; for (int i = 1; i <= n; i++, cout << endl) for (int j = 1; j <= n; j++) if (j == a[i]) cout << " x"; else cout << " ."; }   bool check(int h, int c) { // kiem tra cot for (int i = 1; i < h; i++) if (c == a[i]) return false; // kiem tra duong cheo chinh for (int i = 1; i < h; i++) if (c-h == a[i]-i) return false; // kiem tra duong cheo chinh for (int i = 1; i < h; i++) if (c+h == a[i]+i) return false; return true; }   // dat quan hau o dong thu k void dat(int k) { if (k > n) { print(); return; } for (int i = 1; i <= n; i++) if (check(k, i)) { a[k] = i; dat(k+1); } }   int main() { dat(1); } </iostream>

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