Submission #2244996


Source Code Expand

#include <iostream>
//#include <iomanip>
#include <string>
//#include <algorithm>
//#include <utility>
//#include <stack>
//#include <queue>
//#include <tuple>
//#include <set>
//#include <map>
//#include <unordered_map>
#include <vector>
//#include <functional>
//#include <bitset>
//#include <cmath>
using namespace std;

typedef long long lint;
typedef unsigned long long ulint;
#define MOD 1000000007

int main(){
    string s;
    cin >> s;

    bool chk[200001][26];
    vector<int> beg;
    int r=26,K=0;
    for(int i=0;i<26;i++) chk[s.size()][i]=false;

    for(int at=s.size()-1;at>=0;at--){
        for(int i=0;i<26;i++) chk[at][i]=chk[at+1][i];
        if(!chk[at][s[at]-'a']){
            chk[at][s[at]-'a']=true;
            r--;
        }
        if(r==0){
            r=26;
            for(int i=0;i<26;i++) chk[at][i]=false;
            K++;
            beg.push_back(at);
        }
    }

    string ans="";
    for(char c='a';c<='z';c++){
        if(!chk[0][c-'a']){
            ans=c;
            break;
        }
    }
    for(int i=beg.size()-1;i>=0;i--){
        char last=ans.back();
        int j;
        for(j=beg[i];s[j]!=last;j++);
        for(char c='a';c<='z';c++){
            if(!chk[j+1][c-'a']){
                ans=ans+c;
                break;
            }
        }
    }

    cout << ans << endl;

    return 0;
}

Submission Info

Submission Time
Task E - Don't Be a Subsequence
User wisteria0410ss
Language C++14 (GCC 5.4.1)
Score 600
Code Size 1419 Byte
Status AC
Exec Time 18 ms
Memory 5636 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 600 / 600
Status
AC × 3
AC × 36
Set Name Test Cases
Sample sample1.txt, sample2.txt, sample3.txt
All sample1.txt, sample2.txt, sample3.txt, 1.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 2.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 3.txt, 30.txt, 4.txt, 5.txt, 6.txt, 7.txt, 8.txt, 9.txt, sample1.txt, sample2.txt, sample3.txt
Case Name Status Exec Time Memory
1.txt AC 1 ms 256 KB
10.txt AC 16 ms 5636 KB
11.txt AC 15 ms 5636 KB
12.txt AC 16 ms 5636 KB
13.txt AC 16 ms 5636 KB
14.txt AC 16 ms 5636 KB
15.txt AC 15 ms 5636 KB
16.txt AC 16 ms 5636 KB
17.txt AC 16 ms 5636 KB
18.txt AC 17 ms 5636 KB
19.txt AC 17 ms 5636 KB
2.txt AC 1 ms 256 KB
20.txt AC 18 ms 5636 KB
21.txt AC 18 ms 5636 KB
22.txt AC 18 ms 5636 KB
23.txt AC 18 ms 5636 KB
24.txt AC 15 ms 5636 KB
25.txt AC 15 ms 5636 KB
26.txt AC 15 ms 5636 KB
27.txt AC 14 ms 5636 KB
28.txt AC 15 ms 5636 KB
29.txt AC 15 ms 5636 KB
3.txt AC 2 ms 2432 KB
30.txt AC 15 ms 5636 KB
4.txt AC 2 ms 512 KB
5.txt AC 8 ms 3328 KB
6.txt AC 8 ms 3072 KB
7.txt AC 16 ms 5636 KB
8.txt AC 16 ms 5636 KB
9.txt AC 15 ms 5636 KB
sample1.txt AC 1 ms 256 KB
sample2.txt AC 1 ms 256 KB
sample3.txt AC 1 ms 256 KB