Submission #1057376

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057376		mindiyak	Paths (BOI18_paths)	C++14	23 / 100	2025 ms	1048576 KiB

paths

#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 (int 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,m,k;
vvi paths(3e5+10,vi());
vi color(3e5+10);
ll ans = 0;
map <string,int> cnt;
int counter = 0;
vvi permutations;

void proc(vi perm){
    vi arr2;
    int pos = 0;
    string a = "";

    while(pos < perm.size()){
        a += perm[pos];
        if(cnt.count(a)==0){
            vi arr3;
            if(pos == 0){
                FOR(i,0,n){
                    if(color[i] == perm[pos]){
                        arr3.pb(i);
                    }
                }
            }else{
                for(int a:arr2){
                    for(int b:paths[a]){
                        if(color[b] == perm[pos]){
                            // FOR(i,0,pos+1)cerr << perm[i] << " ";
                            // cerr  << " | " << a << " " << b << " " << color[b] << endl;
                            arr3.pb(b);
                        }
                    }
                }
            }
            cnt[a] = counter;
            counter ++;
            permutations.pb(arr3);
        }
        arr2 = permutations[cnt[a]];
        pos ++;
    }
}
 
void solve()
{
    cin >> n >> m >> k;
    FOR(i,0,n)cin >> color[i];
    FOR(i,0,m){
        int a,b;cin >> a >> b;
        a--;b--;
        paths[a].pb(b);
        paths[b].pb(a);
    }

    vi perm;
    FOR(i,1,k+1)perm.pb(i);
    do { 
        proc(perm); 
    } while (next_permutation(perm.begin(), perm.end())); 

    // cerr << "****" << endl;

    for(auto& [key, value]:cnt){
        // for(int a:key)cerr << a << " ";
        // cerr << " | ";
        // for(int a:value)cerr << a << " ";
        // cerr << endl;
        if(key.size() > 1)ans += permutations[value].size();
    }

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

Compilation message (stderr)

paths.cpp: In function 'void proc(vi)':
paths.cpp:66:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     while(pos < perm.size()){
      |           ~~~~^~~~~~~~~~~~~
paths.cpp: In function 'void solve()':
paths.cpp:115:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  115 |     for(auto& [key, value]:cnt){
      |               ^
paths.cpp: In function 'void init(std::string)':
paths.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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
paths.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: 23 / 23
• Subtask 2: 0 / 20
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30