Submission #654997

#	Time	Username	Problem	Language	Result	Execution time	Memory
654997		ktkerem	Logičari (COCI21_logicari)	C++17	0 / 110	773 ms	524288 KiB

Main

/*#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")/**/
#include<bits/stdc++.h>
/**/
typedef int ll;
//typedef long long ll;
typedef unsigned long long ull;
typedef std::string str;
/*typedef __int128 vll;
typedef unsigned __int128 uvll;*/
#define llll std::pair<ll , ll>
#define pb push_back
#define pf push_front
#define halo cout << "hello\n"
#define fi first
#define sec second
#define all(a) a.begin() , a.end()
const ll limit = 998244353; 
const ll ous = 1e5 + 7;
const ll dx[4] = {-1 , 0 , 1 , 0} , dy[4] = {0,1,0,-1};
std::vector<ll> ar , adj[ous] , vis(ous , 0) , crcol(ous , 0);
ll n , m;
ll f = 0 , s = 0;
ll dfs(ll crt , ll prv){
    vis[crt] = 1;
    for(ll j= 0;adj[crt].size() > j;j++){
        ll pt = adj[crt][j];
        if(pt != prv){
            if(vis[pt] == 1){
                f = crt ; s = pt;
                adj[crt].erase(adj[crt].begin() + j);
                for(ll i = 0;adj[j].size() > i;i++){
                    if(adj[j][i] == crt){
                        adj[j].erase(adj[j].begin() + i);
                        break;
                    }
                }
                return 1;
            }
            if(dfs(pt , crt)){
                return 1;
            }
        }
    }
    return 0;
}
ll sdfs (ll col , ll crt , ll prv){
    if(crcol[crt] != 0){
        if(crcol[crt] == 1 && (col == 2 || col == 3)){
            return -1;
        }
        if(crcol[crt] == 2 && (col == 1 || col == 4)){
            return -1;
        }
        if(crcol[crt] == 3 && (col == 3 || col == 1 || col == 4)){
            return -1;
        }
        if(crcol[crt] == 4 && (col == 3 || col == 4 || col == 2)){
            return -1;
        }
        if(crcol[crt] == 3 && col == 2){
            col = 3;
        }
        if(crcol[crt] == 4 && col == 1){
            col = 4;
        }
    }
    ll kd = 1;
    ll sm = (col == 2 || col == 3);
    for(auto j:adj[crt]){
        if(j != prv){
            kd = 0;
            //std::cout << (col % 4) + 1 << " " << j << " " << crt << std::endl; 
            ll t = sdfs((col % 4) + 1 , j , crt);
            if(t == -1){
                return -1;
            }
            sm += t;
        }
    }
    if(kd && (col == 1 || col == 2)){
        return -1;
    }
    return sm;
}
void solve(){
    std::cin >> n;
    for(ll i = 0;n>i;i++){
        ll x , y;std::cin >> x >> y;
        adj[x].pb(y);
        adj[y].pb(x);
    }
    dfs(1 , 0);
    ll ans = limit;
    crcol[f] = 1;crcol[s] = 1;
    ll t = sdfs(1 , f , 0);
    if(t != -1){
        ans = std::min(ans , t);
    }
    //std::cout << "\n";
    crcol[f] = 2;crcol[s] = 4;
    t = sdfs(2 , f , 0);
    if(t != -1){
        ans = std::min(ans , t);
    }
    //std::cout << "\n";
    crcol[f] = 4;crcol[s] = 2;
    t = sdfs(1 , f , 0);
    if(t != -1){
        ans = std::min(ans , t);
    }
    //std::cout << "\n";    
    crcol[f] = 3;crcol[s] = 3;
    t = sdfs(2 , f , 0);
    if(t != -1){
        ans = std::min(ans , t);
    }
    //std::cout << "\n";
    if(ans == limit){
        std::cout << "-1\n";
        return;
    }
    //std::cout << "\n";    
    std::cout << ans << "\n";
    //std::cout <<f << " " << s << "\n";
    return; /**/
}
signed main(){
    std::ios_base::sync_with_stdio(false);std::cin.tie(NULL);
    ll t=1;
    //std::cin >> t;
    ll o = 1;
    while(t--){ 
        //cout << "Case " << o++ << ":\n";
        solve();
    }
    return 0;
}

Compilation message (stderr)

Main.cpp:5:78: warning: "/*" within comment [-Wcomment]
    5 | #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")/**/
      |                                                                               
Main.cpp: In function 'll dfs(ll, ll)':
Main.cpp:29:33: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'int'} [-Wsign-compare]
   29 |     for(ll j= 0;adj[crt].size() > j;j++){
      |                 ~~~~~~~~~~~~~~~~^~~
Main.cpp:35:44: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'int'} [-Wsign-compare]
   35 |                 for(ll i = 0;adj[j].size() > i;i++){
      |                              ~~~~~~~~~~~~~~^~~
Main.cpp: In function 'int main()':
Main.cpp:135:8: warning: unused variable 'o' [-Wunused-variable]
  135 |     ll o = 1;
      |        ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 40
• Subtask 4: 0 / 50