Submission #1122826

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122826		cpdreamer	Giraffes (JOI22_giraffes)	C++20	10 / 100	4 ms	328 KiB

giraffes

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define P pair
#define S second
#define F first
#define all(v) v.begin(),v.end()
#define V vector
#define pb push_back
const ll MOD=998244353;
void file() {
    freopen("input.txt.txt", "r", stdin);
    freopen("output.txt.txt", "w", stdout);
}
void setIO(string s = "") {
    if (!s.empty()){
        freopen((s + ".in").c_str(), "r", stdin);
        freopen((s + ".out").c_str(), "w", stdout);
    }
    ios::sync_with_stdio(false);
    cin.tie(0);
}
bool check(int n,V<int>A){
    for(int i=0;i<n-1;i++){
        for(int j=i+1;j<n;j++){
            int mind=INT_MAX;
            int maxd=INT_MIN;
            for(int g=i;g<=j;g++){
                mind=min(mind,A[g]);
                maxd=max(maxd,A[g]);
            }
            if(mind<min(A[i],A[j]) && maxd>max(A[i],A[j]))
                return false;
        }
    }
    return true;
}

void solve() {
    int n;
    cin>>n;
    V<int>A(n);
    for(int i=0;i<n;i++){
        cin>>A[i];
    }
    if(check(n,A)){
        cout<<0<<endl;
        return;
    }
    int ans=INT_MAX;
    for(int mask=0;mask<(1<<(n+1));mask++){
        V<int>B=A;
        V<int>C;
        V<int>pos;
        for(int j=0;j<n;j++){
            if(((1<<j)&mask)!=0){
                pos.pb(j);
                C.pb(A[j]);
            }
        }
        sort(all(C));
        for(int i=0;i<(int)pos.size();i++){
            B[pos[i]]=C[i];
        }
        if(check(n,B)){
            ans=min(ans,(int)pos.size());
        }
        reverse(all(C));
        for(int i=0;i<(int)pos.size();i++){
            B[pos[i]]=C[i];
        }
        if(check(n,B)){
            ans=min(ans,(int)pos.size());
        }
    }
    cout<<ans<<endl;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //file();
    solve();
}

Compilation message (stderr)

giraffes.cpp: In function 'void file()':
giraffes.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen("input.txt.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
giraffes.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen("output.txt.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
giraffes.cpp: In function 'void setIO(std::string)':
giraffes.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen((s + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
giraffes.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen((s + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 41