#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pi>> vvpi;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (ll i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int M = 1e9+7;
void init(string name)
{
freopen((name + ".in").c_str(), "r", stdin);
freopen((name + ".out").c_str(), "w", stdout);
}
void fastIO()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
}
int n;
string a;
vvi paths(5e4+5);
int ans = 1;
void dfs(int pos,vi arr,int P1,int P2){
if(pos == a.size())return;
int m = arr.size();
// cerr << int(a[pos]) << " " << P1 << " & " << P2 << " | ";
// for(int b:arr)cerr << b << " ";
// cerr << " -> ";
// EVEN
if(P1 == -1){
if(m >= 1){
if(arr[m-1] == a[pos]){
P1 = m-1;
ans = max(ans,2);
}
}
}else{
if(P1 >= 1){
P1--;
if(arr[P1] == a[pos]){
ans = max(ans,m-P1+1);
}else{
P1 = -1;
}
}
}
// ODD
if(P2 == -1){
if(m >= 2){
if(arr[m-2] == a[pos]){
P2 = m-2;
ans = max(ans,3);
}
}
}else{
if(P2 >= 1){
P2--;
if(arr[P2] == a[pos]){
ans = max(ans,m-P2+1);
}else{
P2 = -1;
}
}
}
// cerr << P1 << " & " << P2 << endl;
arr.pb(a[pos]);
// for(int b:paths[pos]){
// if(b == prev)continue;
// dfs(b,pos,arr,P1,P2);
// }
dfs(pos+1,arr,P1,P2);
}
void solve()
{
cin >> n;
cin >> a;
FOR(i,0,n-1){
int a,b; cin >> a >> b;
a --; b--;
paths[a].pb(b);
paths[b].pb(a);
}
FOR(i,0,1){
vi arr;
dfs(i,arr,-1,-1);
}
cout << ans << endl;
}
int main()
{
fastIO();
// init("test");
int t = 1;
// cin >> t;
while (t--)
solve();
return 0;
}
Compilation message
lampice.cpp: In function 'void dfs(int, vi, int, int)':
lampice.cpp:60:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
60 | if(pos == a.size())return;
| ~~~~^~~~~~~~~~~
lampice.cpp: In function 'void init(std::string)':
lampice.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
44 | freopen((name + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lampice.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
45 | freopen((name + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
2152 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
246 ms |
524288 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
236 ms |
524288 KB |
Execution killed with signal 9 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
2152 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
