oj.uz

Submission #815726

# Submission time Handle Problem Language Result Execution time Memory
815726 2023-08-08T20:10:38 Z exodus_ Ekoeko (COCI21_ekoeko) C++14
20 / 110
 52 ms 5188 KB 
#include<bits/stdc++.h>
using namespace std;
int freq[200]={0};
const int maxn = 200001;
vector<int>exclnt;
deque<int>dex[200];
vector<int>ord;
int segtree[6*maxn]={0};
void update(int idx, int low, int high, int val) {
    if(low==val && high==val) {
        segtree[idx]=1;
        return;
    }
    if(val<low || val>high) {
        return;
    }
    int mid = (low+high)/2;
    update(2*idx,low,mid,val);
    update(2*idx+1, mid+1,high,val);
    segtree[idx] = segtree[2*idx] + segtree[2*idx+1];
}
int quer(int idx, int low, int high, int l, int r) {
    if(low>=l && high<=r) {
        return segtree[idx];
    }
    if(low>r || high<l) return 0;
    int mid = (low+high)/2;
    return quer(2*idx,low,mid,l,r)+quer(2*idx+1,mid+1,high,l,r);
}
int main() {
    int n;
    string gab;
    cin >> n;
    cin >> gab;
    n = n*2;
    for(int i=0; i<gab.size(); i++) freq[gab[i]-'a']++;
    for(int i=0; i<n; i++) {
        if(freq[gab[i]-'a'] > 0) {
            exclnt.push_back(gab[i]-'a');
            freq[gab[i]-'a']-=2;
        }
    }
    int ukex = exclnt.size();
    for(int i=0; i<ukex; i++) {
        exclnt.push_back(exclnt[i]);
    }
    for(int i=0; i<n; i++) {
        dex[exclnt[i]].push_back(i);
    }
    for(int i=0; i<n; i++) {
        ord.push_back(dex[gab[i]-'a'].front());
        dex[gab[i]-'a'].pop_front();
    }
    int ans=0;
    for(int i=0; i<n; i++) {
        ans+=quer(1,1,n-1,ord[i],n-1);
        update(1,1,n-1,ord[i]);
    }
    cout << ans << endl;
    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:36:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(int i=0; i<gab.size(); i++) freq[gab[i]-'a']++;
      |                  ~^~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 16 ms 2392 KB Output is correct
3 Correct 33 ms 4328 KB Output is correct
4 Incorrect 52 ms 5188 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 16 ms 2392 KB Output is correct
3 Correct 33 ms 4328 KB Output is correct
4 Incorrect 52 ms 5188 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 16 ms 2392 KB Output is correct
3 Correct 33 ms 4328 KB Output is correct
4 Incorrect 52 ms 5188 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 456 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct

Subtask #5
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 16 ms 2392 KB Output is correct
3 Correct 33 ms 4328 KB Output is correct
4 Incorrect 52 ms 5188 KB Output isn't correct
5 Halted 0 ms 0 KB -