제출 #333692

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
333692		doowey	Praktični (COCI18_prakticni)	C++14	0 / 130	120 ms	16488 KiB

parkticni

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = (int)1e5 + 10;
const int LOG = 31;

ll vl[N];
vector<pii> T[N];

ll xr[N];

bool vis[N];
int dep[N];

vector<pii> xar;

void dfs(int u, int pp){
    vis[u]=true;
    for(auto x : T[u]){
        if(vis[x.fi]){
            if(dep[u] - dep[x.fi] >= 2){
                xar.push_back(mp(x.se, (xr[u]^xr[x.fi]^vl[x.se])));
            }
        }
        else{
            dep[x.fi] = dep[u]+1;
            xr[x.fi] = xr[u]^vl[x.se];
            dfs(x.fi, u);
        }
    }
}

int main(){
    fastIO;
    //freopen("in.txt", "r", stdin);
    int n, m;
    cin >> n >> m;
    int u, v;
    for(int i = 1; i <= m ; i ++ ){
        cin >> u >> v >> vl[i];
        T[u].push_back(mp(v,i));
        T[v].push_back(mp(u,i));
    }
    for(int i = 1; i <= n; i ++ ){
        if(!vis[i]){
            dfs(i,-1);
        }
    }
    int idx;
    vector<vector<int>> soln;
    vector<int> ss;
    for(int b = 0; b < LOG; b ++ ){
        idx = -1;
        for(int i = 0 ; i < xar.size(); i ++ ){
            if((xar[i].se & (1 << b))){
                idx = i;
            }
        }
        if(idx != -1){
            ss.push_back(xar[idx].se);
            soln.push_back({});
            int vv = xar[idx].se;
            for(auto &q : xar){
                if((q.se & (1 << b))){
                    q.se ^= vv;
                    soln.back().push_back(xar[idx].fi);
                }
            }
        }
    }
    cout << soln.size() << "\n";
    for(int i = 0 ; i < ss.size(); i ++ ){
        cout << ss[i] << " ";
        cout << soln[i].size() << " ";
        for(auto x : soln[i]) cout << x << " ";
        cout << "\n";
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

parkticni.cpp: In function 'int main()':
parkticni.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for(int i = 0 ; i < xar.size(); i ++ ){
      |                         ~~^~~~~~~~~~~~
parkticni.cpp:81:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |     for(int i = 0 ; i < ss.size(); i ++ ){
      |                     ~~^~~~~~~~~~~

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