제출 #96287

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
96287		dalgerok	Praktični (COCI18_prakticni)	C++14	0 / 130	111 ms	14580 KiB

parkticni

#include<bits/stdc++.h>
using namespace std;



const int N = 1e5 + 5;




int n, m, d[N], cl[N];
vector < pair < pair < int, int >, int > > g[N];
vector < pair < int, int > > e;

void dfs(int v, int pr = -1){
    cl[v] = 1;
    for(auto it : g[v]){
        int to = it.first.first, len = it.first.second;
        if(to != pr){
            if(!cl[to]){
                d[to] = (d[v] ^ len);
                dfs(to, v);
            }
            else if(cl[to] == 1){
                e.push_back(make_pair((d[v] ^ len ^ d[to]), it.second));
            }
        }
    }
    cl[v] = 2;
}

vector < int > bas;
map < int, vector < int > > ans;
inline void add(int x){
    for(auto it : bas){
        x = min(x, (x ^ it));
    }
    if(!x){
        return;
    }
    for(auto &it : bas){
        it = min(it, (it ^ x));
    }
    bas.push_back(x);
    sort(bas.rbegin(), bas.rend());
}
inline void upd(int x, int y){
    int cur = 0;
    for(auto it : bas){
        if((x ^ it) < x){
            cur ^= it;
            x ^= it;
        }
    }
    ans[cur].push_back(y);
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= m; i++){
        int x, y, z;
        cin >> x >> y >> z;
        g[x].push_back(make_pair(make_pair(y, z), i));
        g[y].push_back(make_pair(make_pair(x, z), i));
    }
    dfs(1);
    for(auto it : e){
        if(it.first){
            add(it.first);
        }
    }
    for(auto it : e){
        if(it.first){
            upd(it.first, it.second);
        }
    }
    cout << (int)ans.size() << "\n";
    for(auto it : ans){
        cout << it.first << " ";
        for(auto x : it.second){
            cout << x << " ";
        }
        cout << "\n";
    }
}

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