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Submission #1066749

# Submission time Handle Problem Language Result Execution time Memory
1066749 2024-08-20T06:15:52 Z 12345678 Alternating Current (BOI18_alternating) C++17
0 / 100
 3000 ms 2776 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;

mt19937 rng(time(0));

int n, m, a[nx], b[nx], cur[nx], dp[nx], res[nx];
vector<pair<int, int>> v;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=0; i<m; i++) 
    {
        cin>>a[i]>>b[i];
        v.push_back({b[i], i});
    }
    for (int t=0; t<1; t++)
    {
        //for (int i=0; i<m; i++) v[i].first=rng(), res[i]=0;
        for (int i=1; i<=n; i++) cur[i]=dp[i]=0;
        //sort(v.begin(), v.end());
        for (int i=0; i<m;i ++)
        {
            if (a[i]<=b[i]) for (int j=a[i]; j<=b[i]; j++) cur[j]++;
            else
            {
                for (int j=a[i]; j<=n; j++) cur[j]++;
                for (int j=1; j<=b[i]; j++) cur[j]++;
            }
        }
        for (int i=0; i<m; i++)
        {
            int idx=v[i].second;
            int mn=INT_MAX;
            if (a[idx]<=b[idx]) for (int j=a[idx]; j<=b[idx]; j++) mn=min(mn, cur[j]);
            else
            {
                for (int j=a[idx]; j<=n; j++) mn=min(mn, cur[j]);
                for (int j=1; j<=b[idx]; j++) mn=min(mn, cur[j]);
            }
            if (mn>=2)
            {
                res[idx]=1;
                if (a[idx]<=b[idx]) for (int j=a[idx]; j<=b[idx]; j++) cur[j]--, dp[j]++;
                else
                {
                    for (int j=a[idx]; j<=n; j++) cur[j]--, dp[j]++;
                    for (int j=1; j<=b[idx]; j++) cur[j]--, dp[j]++;
                }
            }
        }
        int f=0;
        for (int i=1;i <=n;i ++) if (dp[i]==0) f=1;
        if (!f)
        {
            for (int i=0; i<m;i ++) cout<<res[i];
            return 0;
        }
    }
    cout<<"impossible";
}

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Incorrect 0 ms 348 KB 'impossible' claimed, but there is a solution
19 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Incorrect 0 ms 348 KB 'impossible' claimed, but there is a solution
19 Halted 0 ms 0 KB -

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Incorrect 0 ms 348 KB 'impossible' claimed, but there is a solution
19 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3048 ms 2776 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Incorrect 0 ms 348 KB 'impossible' claimed, but there is a solution
19 Halted 0 ms 0 KB -