update

day3/T433080/T433080.cpp

@@ -2,8 +2,7 @@
 using namespace std;
 
 #define PRINT_VEC(v){cout<<#v<<" [";for(size_t i=0;i<v.size();i++)cout<<v[i]<<(i!=v.size()-1?",":"]\n");}
-#define GET_ARRAY_LEN(a)sizeof(a)/sizeof(a[0])
-
+#define GET_ARRAY_LEN(a)(sizeof(a)/sizeof(a[0]))
 
 int main() {
     {

day3/U184510/U184510.cpp

@@ -1,6 +1,54 @@
 #include<bits/stdc++.h>
 using namespace std;
 
-int main(){
+#define GET_ARRAY_LEN(a)(sizeof(a)/sizeof(a[0]))
+#define SET_ARRAY(a){for(size_t i=0;i<GET_ARRAY_LEN(a);i++)a[i]=0;}
+#define PRINT_VALUE(v){cout<<#v<<" :"<<v<<endl;}
+#define PRINT_ARRAY(a,len){cout<<#a<<" [";for(unsigned int i=0;i<len;i++){cout<<a[i]<<(i!=len-1?",":"]\n");}}
 
+unsigned int n;
+unsigned cnt=0;
+unsigned arrange_num=0;
+
+void sort_fix(int arr[]){
+    for(int i=0;i<n;i++){
+        for(int j=0;j<n-i-1;j++){
+            if(arr[j]>arr[j+1]){
+                swap(arr[j],arr[j+1]);
+                cnt++;
+            }
+        }
+    }
+}
+
+void build_array(unsigned int now,unsigned int end,int arr[],bool visited[]){
+    if(now==end){
+        // PRINT_VALUE(cnt);
+        // PRINT_ARRAY(arr, n);
+        sort_fix(arr);
+        // PRINT_VALUE(cnt);
+        arrange_num++;
+        return;
+    }
+    for (unsigned int i=1; i<=n; i++) {
+        if (visited[i]==true) {
+            continue;
+        }
+        visited[i]=true;
+        arr[now]=i;
+        // PRINT_ARRAY(visited, n+1);
+        build_array(now+1, end, arr, visited);
+        visited[i]=false;
+    }   
+}
+
+int main(){
+    cin>>n;
+    bool visited[n+1];
+    // SET_ARRAY(visited);
+    int arr[n+1];
+    build_array(0, n,arr,visited);
+    // PRINT_VALUE(cnt);
+    // PRINT_VALUE(arrange_num);
+    cout<<(cnt/arrange_num)%(int)(1e9+7)<<endl;
 }