Submission #784024

#	Time	Username	Problem	Language	Result	Execution time	Memory
784024		GrindMachine	Izlet (COI19_izlet)	C++17	25 / 100	456 ms	35740 KiB

izlet

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 3000 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

vector<pii> adj[N];
vector<int> ans(N);
vector<bool> vis(N);

void dfs(int u){
    vis[u] = 1;
    for(auto [v,w] : adj[u]){
        if(vis[v]){
            assert(ans[v] == ans[u]^w);
        }
        else{
            ans[v] = ans[u]^w;
            dfs(v);   
        }
    }
}

void solve(int test_case)
{
    int s; cin >> s;
    int n; cin >> n;
    int a[n+5][n+5];
    rep1(i,n) rep1(j,n) cin >> a[i][j];
    
    if(s == 1){
        rep1(i,n){
            for(int j = i+1; j <= n; ++j){
                if(a[i][j] == 1){
                    adj[i].pb({j,0});
                    adj[j].pb({i,0});
                }
                else{
                    adj[i].pb({j,1});
                    adj[j].pb({i,1});
                    break;
                }
            }
        }

        rep1(i,n){
            if(!vis[i]){
                ans[i] = 0;
                dfs(i);
            }
        }

        rep1(i,n) ans[i]++;

        rep1(i,n) cout << ans[i] << " ";
        cout << endl;

        vector<int> here[3];
        rep1(i,n) here[ans[i]].pb(i);

        vector<pii> edges;
        rep1(c,2){
            rep1(i,sz(here[c])-1){
                edges.pb({here[c][i-1],here[c][i]});
            }

            if(c+1 <= 2){
                edges.pb({here[c].back(), here[c+1].front()});
            }
        }

        for(auto [u,v] : edges){
            cout << u << " " << v << endl;
        }

        return;
    }

    vector<int> active(n+5);
    vector<int> nxt(n+5,-1);

    rep1(i,n){
        int expect = 1;
        rev(j,i-1,1){
            expect += active[j];
            if(a[i][j] != expect){
                nxt[j] = i;
                active[j] = 0;
                break;
            }
        }
        active[i] = 1;
    }

    vector<bool> vis(n+5);
    int ptr = 1;

    rep1(i,n){
        if(vis[i]) conts;
        int j = i;
        while(j != -1){
            vis[j] = 1;
            ans[j] = ptr;
            j = nxt[j];
        }
        ptr++;
    }

    rep1(i,n) cout << ans[i] << " ";
    cout << endl;

    rep1(i,n-1) cout << i << " " << i+1 << endl;
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

Compilation message (stderr)

In file included from /usr/include/c++/10/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:45,
                 from /usr/include/c++/10/ext/pb_ds/detail/container_base_dispatch.hpp:90,
                 from /usr/include/c++/10/ext/pb_ds/assoc_container.hpp:48,
                 from izlet.cpp:4:
izlet.cpp: In function 'void dfs(int)':
izlet.cpp:70:27: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
   70 |             assert(ans[v] == ans[u]^w);
izlet.cpp: In function 'void solve(int)':
izlet.cpp:31:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 | #define rep1(i, n) for(int i = 1; i <= n; ++i)
......
  118 |             rep1(i,sz(here[c])-1){
      |                  ~~~~~~~~~~~~~~~     
izlet.cpp:118:13: note: in expansion of macro 'rep1'
  118 |             rep1(i,sz(here[c])-1){
      |             ^~~~

• Subtask 1: 0 / 18
• Subtask 2: 25 / 25
• Subtask 3: 0 / 57