Submission #994790

#	Time	Username	Problem	Language	Result	Execution time	Memory
994790		guagua0407	Editor (BOI15_edi)	C++17	35 / 100	33 ms	3420 KiB

edi

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=3e5+5;
int e[mxn];

int main() {_
    int n;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>e[i];
        //cout<<e[i]<<' ';
    }
    //cout<<'\n';
    if(n<=5000){
        vector<bool> active(n+1);
        vector<int> prv(n+1);
        set<pair<int,int>> S;
        S.insert({-1,0});
        for(int i=1;i<=n;i++){
            if(e[i]>=0){
                active[i]=true;
                S.insert({i,e[i]});
            }
            else{
                active[i]=true;
                int x;
                for(int j=i-1;j>=0;j--){
                    if(active[j] and (e[j]>=0 or e[j]>e[i])){
                        x=j;
                        break;
                    }
                }
                //cout<<i<<' '<<x<<'\n';
                prv[i]=x;
                while(e[x]<0){
                    active[x]=!active[x];
                    x=prv[x];
                }
                active[x]=!active[x];
                if(active[x]){
                    S.insert({x,e[x]});
                }
                else{
                    S.erase({x,e[x]});
                }
            }
            cout<<(*S.rbegin()).s<<'\n';
        }
        return 0;
    }
    vector<int> ans;
    ans.push_back(0);
    for(int i=1;i<=n;i++){
        if(e[i]>=0) ans.push_back(e[i]);
        else ans.pop_back();
        cout<<ans.back()<<'\n';
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message (stderr)

edi.cpp: In function 'void setIO(std::string)':
edi.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
edi.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
edi.cpp: In function 'int main()':
edi.cpp:52:40: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |                     active[x]=!active[x];
      |                                        ^

• Subtask 1: 20 / 20
• Subtask 2: 15 / 15
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37