'commit'

TangDou/XiTi/1314_2.cpp

@@ -0,0 +1,68 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int ans = 0, m;
+vector<int> data;
+
+void print();
+
+void fun1(int n, int k) {//递减
+    if (n < 0) return;
+    if (n == 0) {
+        ans++;
+        print();
+    }
+    int i;
+    for (i = k; i >= 1; i--) {
+        data.push_back(i);
+        fun1(n - i, i);
+
+        for (vector<int>::iterator j = data.begin(); j != data.end(); j++) {
+            if (*j == i) {
+                data.erase(j);
+                break;
+            }
+        }
+    }
+}
+
+void fun2(int n, int k) {//递增
+    if (n < 0) return;
+    if (n == 0) {
+        ans++;
+        print();
+    }
+    int i;
+    for (i = k; i <= n; i++) {
+        data.push_back(i);
+        fun2(n - i, i);
+        for (vector<int>::iterator j = data.begin(); j != data.end(); j++) {
+            if (*j == i) {
+                data.erase(j);
+                break;
+            }
+        }
+    }
+}
+
+void print() {
+    int i;
+    cout << m << "=";
+    cout << data[0];
+    for (i = 1; i < data.size(); i++) {
+        cout << "+" << data[i];
+    }
+    cout << endl;
+}
+
+int main() {
+    m=5;
+    cout << "递减：" << endl;
+    fun1(m, m);
+    ans = 0;
+    cout << "递增：" << endl;
+    fun2(m, 1);
+    return 0;
+}
+