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Submission #885144

# Submission time Handle Problem Language Result Execution time Memory
885144 2023-12-09T04:27:11 Z votranngocvy Difference (POI11_roz) C++14
60 / 100
 1000 ms 18760 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 1e6 + 5;
char a[N];
vector<int>pos[30];
int n,val[N],maxPreSum[N],maxSufSum[N];

int calc(int a,int b) {
    if (pos[a].size() == 0 || pos[b].size() == 0) return 0;
    for (int i = 1; i <= n; i++) val[i] = 0;
    for (auto x: pos[a]) val[x] = 1;
    for (auto x: pos[b]) val[x] = -1;
    maxPreSum[0] = maxSufSum[n + 1] = 0;
    int sum = 0;
    for (int i = 1; i <= n; i++) {
        sum = max(sum + val[i],val[i]);
        maxPreSum[i] = sum;
    }
    sum = 0;
    for (int i = n; i > 0; i--) {
        sum = max(sum + val[i],val[i]);
        maxSufSum[i] = sum;
    }
    int ans = 0;
    for (auto i: pos[b]) {
        int tmp = maxPreSum[i - 1] + maxSufSum[i + 1] - 1;
        tmp = max(tmp,maxPreSum[i - 1] - 1);
        tmp = max(tmp,maxSufSum[i - 1] - 1);
        ans = max(ans,tmp);
    }
    return ans;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= n; i++) pos[a[i] - 'a'].push_back(i);
    int ans = 0;
    for (int i = 0; i < 26; i++)
        for (int j = 0; j < 26; j++) 
            if (i != j) ans = max(ans,calc(i,j));
    cout << ans << "\n";
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6492 KB Output is correct
2 Correct 1 ms 6488 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 6748 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 193 ms 11476 KB Output is correct
2 Correct 1 ms 6744 KB Output is correct
3 Correct 32 ms 6820 KB Output is correct

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1008 ms 18624 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1048 ms 18636 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1048 ms 18760 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1044 ms 18528 KB Time limit exceeded
2 Halted 0 ms 0 KB -