Submission #1067842

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067842		mindiyak	Lampice (COCI19_lampice)	C++14	25 / 110	5031 ms	2384 KiB

lampice

#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,int P1,int P2){
    
    if(pos == a.size())return;

    // EVEN
    if(P1 == -1){
        if(pos >= 1){
            if(a[pos-1] == a[pos]){
                P1 = pos-1;
                ans = max(ans,2);
            }
        }
    }else{
        if(P1 >= 1){
            P1--;
            if(a[P1] == a[pos]){
                ans = max(ans,pos-P1+1);
            }else{
                P1 = -1;
            }
        }
    }

    // ODD
    if(P2 == -1){
        if(pos >= 2){
            if(a[pos-2] == a[pos]){
                P2 = pos-2;
                ans = max(ans,3);
            }
        }
    }else{
        if(P2 >= 1){
            P2--;
            if(a[P2] == a[pos]){
                ans = max(ans,pos-P2+1);
            }else{
                P2 = -1;
            }
        }
    }

    // cerr << P1 << " & " << P2 << endl;

    dfs(pos+1,P1,P2);
}

void solve()
{
    cin >> n;
    cin >> a;
    FOR(i,0,n-1){
        int a,b; cin >> a >> b;
    }

    FOR(i,0,n)
        dfs(i,-1,-1);

    cout << ans << endl;
}   
 
 
int main()
{
    fastIO();
    // init("test");
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message (stderr)

lampice.cpp: In function 'void dfs(int, 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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 17
• Subtask 2: 25 / 25
• Subtask 3: 0 / 31
• Subtask 4: 0 / 37