Submission #1015526

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015526		Hanksburger	Martian DNA (BOI18_dna)	C++17	100 / 100	76 ms	19928 KiB

dna

#include <bits/stdc++.h>
using namespace std;
int a[200005], b[200005], c[200005];
vector<int> v[200005];
set<int> s;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, k, r, mn;
    cin >> n >> k >> r;
    for (int i=1; i<=n; i++)
    {
        cin >> a[i];
        v[a[i]].push_back(i);
    }
    for (int i=1; i<=r; i++)
    {
        int x, y;
        cin >> x >> y;
        b[x]=y;
    }
    for (int i=0; i<k; i++)
    {
        if (v[i].size()<b[i])
        {
            cout << "impossible";
            return 0;
        }
        if (b[i])
            s.insert(v[i][b[i]-1]);
    }
    mn=*s.rbegin();
    for (int i=1; i<=n; i++)
    {
        if (b[a[i]])
        {
            s.erase(v[a[i]][c[a[i]]+b[a[i]]-1]);
            if (v[a[i]].size()<=c[a[i]]+b[a[i]])
                break;
            s.insert(v[a[i]][c[a[i]]+b[a[i]]]);
            c[a[i]]++;
        }
        mn=min(mn, *s.rbegin()-i);
    }
    cout << mn;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:26:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   26 |         if (v[i].size()<b[i])
      |             ~~~~~~~~~~~^~~~~
dna.cpp:40:31: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   40 |             if (v[a[i]].size()<=c[a[i]]+b[a[i]])
      |                 ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32