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Submission #223450

# Submission time Handle Problem Language Result Execution time Memory
223450 2020-04-15T09:26:35 Z dantoh000 Lampice (COCI19_lampice) C++14
73 / 110
 5000 ms 9856 KB 
#include <bits/stdc++.h>
using namespace std;
int n;
vector<int> adjlist[50005];
int ans = 1;
string s;
void maxlpalindrome(vector<char> s){
    //for (auto x : s) printf("%c",x);
    //printf(" processing\n");
    int n = s.size();
    ///For odd-length palindrome
    vector<int> d1(n,0);
    for (int i = 0, l = 0, r = -1; i < n; i++) {
        int k = (i > r) ? 1 : min(d1[l + r - i], r - i + 1);
        while (0 <= i - k && i + k < n && s[i - k] == s[i + k]) {
            k++;
        }
        d1[i] = k--;
        if (i + k > r) {
            l = i - k;
            r = i + k;
        }
    }
    ///For even-length palindromes
    vector<int> d2(n,0);
    for (int i = 0, l = 0, r = -1; i < n; i++) {
        int k = (i > r) ? 0 : min(d2[l + r - i + 1], r - i + 1);
        while (0 <= i - k - 1 && i + k < n && s[i - k - 1] == s[i + k]) {
            k++;
        }
        d2[i] = k--;
        if (i + k > r) {
            l = i - k - 1;
            r = i + k ;
        }
    }
    for (int i = 0; i < n; i++){
        ans = max(ans,max(2*d1[i]-1,2*d2[i]));
    }
}
vector<char> st;
void dfs(int u, int p){
    st.push_back(s[u-1]);
    int k = 0;
    for (auto v : adjlist[u]){
        if (v == p) continue;
        k = 1;
        dfs(v,u);
    }
    if (k == 0) maxlpalindrome(st);
    st.pop_back();
}
int main(){
    scanf("%d",&n);
    cin >> s;
    for (int i = 0; i < n-1; i++){
        int a,b;
        scanf("%d%d",&a,&b);
        adjlist[a].push_back(b);
        adjlist[b].push_back(a);
    }
    for (int i = 1; i <= n; i++){
        if (adjlist[i].size() == 1){
            st.clear();
            dfs(i,-1);
        }
    }
    printf("%d",ans);

}

Compilation message

lampice.cpp: In function 'int main()':
lampice.cpp:54:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
lampice.cpp:58:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&a,&b);
         ~~~~~^~~~~~~~~~~~~~

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 1536 KB Output is correct
2 Correct 63 ms 1536 KB Output is correct
3 Correct 289 ms 1536 KB Output is correct
4 Correct 924 ms 1640 KB Output is correct
5 Correct 6 ms 1536 KB Output is correct
6 Correct 5 ms 1536 KB Output is correct
7 Correct 5 ms 1536 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 8736 KB Output is correct
2 Correct 30 ms 8992 KB Output is correct
3 Correct 31 ms 9112 KB Output is correct
4 Correct 32 ms 9480 KB Output is correct
5 Correct 33 ms 9848 KB Output is correct
6 Correct 36 ms 9856 KB Output is correct

Subtask #3
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 998 ms 5376 KB Output is correct
2 Correct 617 ms 4728 KB Output is correct
3 Correct 1361 ms 6012 KB Output is correct
4 Correct 949 ms 6056 KB Output is correct
5 Correct 562 ms 4600 KB Output is correct
6 Correct 597 ms 4472 KB Output is correct

Subtask #4
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 1536 KB Output is correct
2 Correct 63 ms 1536 KB Output is correct
3 Correct 289 ms 1536 KB Output is correct
4 Correct 924 ms 1640 KB Output is correct
5 Correct 6 ms 1536 KB Output is correct
6 Correct 5 ms 1536 KB Output is correct
7 Correct 5 ms 1536 KB Output is correct
8 Correct 34 ms 8736 KB Output is correct
9 Correct 30 ms 8992 KB Output is correct
10 Correct 31 ms 9112 KB Output is correct
11 Correct 32 ms 9480 KB Output is correct
12 Correct 33 ms 9848 KB Output is correct
13 Correct 36 ms 9856 KB Output is correct
14 Correct 998 ms 5376 KB Output is correct
15 Correct 617 ms 4728 KB Output is correct
16 Correct 1361 ms 6012 KB Output is correct
17 Correct 949 ms 6056 KB Output is correct
18 Correct 562 ms 4600 KB Output is correct
19 Correct 597 ms 4472 KB Output is correct
20 Execution timed out 5056 ms 2944 KB Time limit exceeded
21 Halted 0 ms 0 KB -