oj.uz

Submission #223447

# Submission time Handle Problem Language Result Execution time Memory
223447 2020-04-15T09:25:48 Z dantoh000 Lampice (COCI19_lampice) C++14
56 / 110
 1341 ms 10496 KB 
#include <bits/stdc++.h>
using namespace std;
int n;
vector<int> adjlist[50005];
int ans = 0;
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
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 1536 KB Output is correct
2 Correct 59 ms 1536 KB Output is correct
3 Correct 301 ms 1660 KB Output is correct
4 Correct 925 ms 1656 KB Output is correct
5 Incorrect 5 ms 1536 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 8744 KB Output is correct
2 Correct 31 ms 9504 KB Output is correct
3 Correct 32 ms 9744 KB Output is correct
4 Correct 33 ms 10112 KB Output is correct
5 Correct 34 ms 10496 KB Output is correct
6 Correct 35 ms 10496 KB Output is correct

Subtask #3
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 977 ms 5240 KB Output is correct
2 Correct 626 ms 5240 KB Output is correct
3 Correct 1341 ms 5844 KB Output is correct
4 Correct 997 ms 6076 KB Output is correct
5 Correct 559 ms 4472 KB Output is correct
6 Correct 616 ms 4472 KB Output is correct

Subtask #4
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 1536 KB Output is correct
2 Correct 59 ms 1536 KB Output is correct
3 Correct 301 ms 1660 KB Output is correct
4 Correct 925 ms 1656 KB Output is correct
5 Incorrect 5 ms 1536 KB Output isn't correct
6 Halted 0 ms 0 KB -