Submission #419408

#	Time	Username	Problem	Language	Result	Execution time	Memory
419408		juggernaut	Group Photo (JOI21_ho_t3)	C++17	5 / 100	6 ms	296 KiB

Main

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
typedef long long ll;
#define USING_ORDERED_SET 0
#if USING_ORDERED_SET
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef IOI2021SG
    #define printl(args...)printf(args)
#else
    #define printl(args...)((void)0)
#endif
int n,a[10],b[10],c[10];
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++)scanf("%d",&a[i]);
    iota(b+1,b+1+n,1);
    int mx=2e9;
    do{
        bool valid=true;
        for(int i=1;i<n;i++)if(b[i]>b[i+1]+1)valid=false;
        if(!valid)continue;
        for(int i=1;i<=n;i++)c[i]=b[i];
        int cnt=0;
        for(int i=1;i<=n;i++){
            int id;
            for(int j=i;j<=n;j++)if(c[j]==a[i])id=j;
            while(id>i){
                swap(c[id],c[id-1]);
                id--;
                cnt++;
            }
        }
        umin(mx,cnt);
    }while(next_permutation(b+1,b+1+n));
    printf("%d",mx);
}

Compilation message (stderr)

Main.cpp: In function 'void usaco(std::string)':
Main.cpp:5:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:5:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
Main.cpp:23:31: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     for(int i=1;i<=n;i++)scanf("%d",&a[i]);
      |                          ~~~~~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36