Submission #699486

#	Time	Username	Problem	Language	Result	Execution time	Memory
699486		Cross_Ratio	Teoretičar (COCI18_teoreticar)	C++14	13 / 130	271 ms	31328 KiB

teoreticar

#include <bits/stdc++.h>
using namespace std;
int num[500005];
vector<array<int, 2>> adj[100005];
set<int> C[100005];
int num_cnt = 0;
array<int, 2> Edge[500005];
signed main() {
    cin.sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int L, R, M;
    cin >> L >> R >> M;
    int i, j;
    for(i=0;i<M;i++) {
        int a, b;
        cin >> a >> b;
        adj[a-1].push_back({b-1, i});
        Edge[i] = {a-1, b-1};
    }
    if(M <= 200000) {
        vector<int> V;
        for(i=0;i<L;i++) V.push_back(i);
        sort(V.begin(),V.end(),[&](int x, int y) {
             return adj[x].size()>adj[y].size();
             });
        for(int i : V) {
            set<int> S;
            for(auto n : adj[i]) {
                bool isPos = false;
                for(j=0;j<num_cnt;j++) {
                    if(S.find(j) == S.end() && C[j].find(n[0])==C[j].end()) {
                        num[n[1]] = j;
                        C[j].insert(n[0]);
                        S.insert(j);
                        isPos = true;
                        break;
                    }
                }
                if(!isPos) {
                    num[n[1]] = num_cnt;
                    C[num_cnt].insert(n[0]);
                    S.insert(num_cnt);
                    num_cnt++;
                }
            }
        }
        cout << num_cnt << '\n';
        for(i=0;i<M;i++) cout << num[i] + 1 << '\n';
        return 0;
    }
    vector<int> idx;
    for(i=0;i<M;i++) {
        idx.push_back(Edge[i][0]^Edge[i][1]);
        num[i] = Edge[i][0]^Edge[i][1];
    }
    sort(idx.begin(),idx.end());
    idx.erase(unique(idx.begin(),idx.end()),idx.end());
    for(i=0;i<M;i++) {
        num[i] = lower_bound(idx.begin(),idx.end(),num[i]) - idx.begin();
    }
    cout << idx.size() << '\n';
    for(i=0;i<M;i++) cout << num[i]+1 << '\n';
}

• Subtask 1: 0 / 13
• Subtask 2: 13 / 13
• Subtask 3: 0 / 13
• Subtask 4: 0 / 13
• Subtask 5: 0 / 13
• Subtask 6: 0 / 13
• Subtask 7: 0 / 13
• Subtask 8: 0 / 13
• Subtask 9: 0 / 13
• Subtask 10: 0 / 13