Submission #940844

#	Time	Username	Problem	Language	Result	Execution time	Memory
940844		Maite_Morale	Group Photo (JOI21_ho_t3)	C++14	44 / 100	1 ms	1236 KiB

Main

#include<bits/stdc++.h>
#define F first
#define S second
#define MAX 505
#define oo 1e18
#define mod 1000000007
#define fast_in ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);cout.setf(ios::fixed);cout.precision(0);
using namespace std;
typedef long long ll;
#define pll pair<ll , ll>
#define vll vector<ll>
#define vvll vector<vll>
#define vpll vector<pll>
 
struct ABI{
    vll sum;
    ABI(ll n){
        sum.assign(n+10,0);
    }
    void update(ll a,ll b){
        if(a<1 || a>=sum.size()){cout<<"anormalona";return;}
        for(a;a<sum.size();a+=(a&-a))sum[a]+=b;
    }
    ll query(ll a){ll r=0;
        if(a<1)return r;
        a=min(a,(ll)sum.size()-1);
        for(a;a>0;a-=(a&-a))r+=sum[a];
    return r;
    }
    ll query(ll a,ll b){
        if(a>b)swap(a,b);
        return query(b)-query(a-1);
    }
} abi1(MAX),abi2(MAX);
ll t,n,a[MAX],mp[MAX],best[MAX],dp[MAX][MAX];
int main(){
    fast_in
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];mp[a[i]]=i;
        best[i]=oo;
    }
    for(int i=1;i<=n;i++){
        dp[i][i-1]=best[i-1];
        for(int j=i;j<=n;j++){
            dp[i][j]=dp[i][j-1]+j-1-abi1.query(1,mp[j])-abi2.query(mp[j],n+1);

            abi2.update(mp[j],1);
        }
        for(int j=i;j<=n;j++){
            best[j]=min(best[j],dp[i][j]);
            abi2.update(mp[j],-1);
        }
        abi1.update(mp[i],1);
    }
    cout<<best[n];
return 0;
}

Compilation message (stderr)

Main.cpp: In member function 'void ABI::update(ll, ll)':
Main.cpp:21:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         if(a<1 || a>=sum.size()){cout<<"anormalona";return;}
      |                   ~^~~~~~~~~~~~
Main.cpp:22:13: warning: statement has no effect [-Wunused-value]
   22 |         for(a;a<sum.size();a+=(a&-a))sum[a]+=b;
      |             ^
Main.cpp:22:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         for(a;a<sum.size();a+=(a&-a))sum[a]+=b;
      |               ~^~~~~~~~~~~
Main.cpp: In member function 'll ABI::query(ll)':
Main.cpp:27:13: warning: statement has no effect [-Wunused-value]
   27 |         for(a;a>0;a-=(a&-a))r+=sum[a];
      |             ^

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