Submission #206553

#	Time	Username	Problem	Language	Result	Execution time	Memory
206553		wiwiho	Slagalica (COCI19_slagalica2)	C++14	70 / 70	92 ms	13164 KiB

slagalica

//#define NDEBUG

#include <bits/stdc++.h>
#include <bits/extc++.h>

#define StarBurstStream ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define iter(a) a.begin(), a.end()
#define riter(a) a.rbegin(), a.rend()
#define lsort(a) sort(iter(a))
#define gsort(a) sort(riter(a))
#define mp(a, b) make_pair(a, b)
#define pb(a) push_back(a)
#define eb(a) emplace_back(a)
#define pf(a) push_front(a)
#define pob pop_back()
#define pof pop_front()
#define F first
#define S second
#define printv(a, b) {bool pvaspace=false; \
for(auto pva : a){ \
    if(pvaspace) b << " "; pvaspace=true;\
    b << pva;\
}\
b << "\n";}
#define pii pair<int, int>
#define pll pair<ll, ll>
#define tiii tuple<int, int, int>
#define mt make_tuple
#define gt(t, i) get<i>(t)
#define iceil(a, b) ((a) / (b) + !!((a) % (b)))

//#define TEST

typedef long long ll;
typedef unsigned long long ull;

using namespace std;
using namespace __gnu_pbds;

const ll MOD = 1000000007;
const ll MAX = 2147483647;

template<typename A, typename B>
ostream& operator<<(ostream& o, pair<A, B> p){
    return o << '(' << p.F << ',' << p.S << ')';
}

vector<deque<pii>> g(4);

vector<int> ans;

void dfs(int now, int t){
//    cerr << now << " " << t << "\n";
    while(!g[now].empty()){
        pii i = g[now].front();
        g[now].pof;
        dfs(i.S, i.F);
    }
    if(t != -1) ans.eb(t);
}

int main(){
    StarBurstStream

    int n;
    cin >> n;

    vector<int> from = {-1, 1, 1, 2, 2, 0, 0, 1, 2};
    vector<int> to = {-1, 2, 1, 2, 1, 2, 1, 3, 3};

    map<int, int> tmp;
    vector<int> in(4), out(4);
    for(int i = 0; i < n ;i++){
        int x, a;
        cin >> x >> a;
        g[from[x]].eb(mp(a, to[x]));
        tmp[a] = x;
        out[from[x]]++;
        in[to[x]]++;
    }

    for(int i = 1; i <= 2; i++){
        if(in[i] != out[i]){
            cout << "-1\n";
            return 0;
        }
    }

    for(int i = 0; i < 4; i++) lsort(g[i]);

    dfs(0, -1);
    reverse(iter(ans));
    if(ans.size() != n || from[tmp[ans.front()]] != 0 || to[tmp[ans.back()]] != 3){
        cout << "-1\n";
    }
    else printv(ans, cout);

    return 0;
}

Compilation message (stderr)

slagalica.cpp: In function 'int main()':
slagalica.cpp:93:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(ans.size() != n || from[tmp[ans.front()]] != 0 || to[tmp[ans.back()]] != 3){
        ~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5