Submission #101496

#	Time	Username	Problem	Language	Result	Execution time	Memory
101496		cheeheng	Adriatic (CEOI13_adriatic)	C++14	0 / 100	190 ms	60548 KiB

adriatic

#include <bits/stdc++.h>

using namespace std;

typedef pair<int, int> ii;

int R[250000];
int C[250000];

int dist[250000];

vector<int> AdjList[250005];
vector<int> AdjList2[250005];

ii EdgeList[250005];

int rank1[250005];
int p[250005];

void init(int N){
    for(int i = 0; i < N; i ++){
        rank1[i] = 0;
        p[i] = i;
    }
}

int findSet(int i){
    return (p[i] == i) ? i : (p[i] = findSet(p[i]));
}

bool isSameSet(int i, int j){
    return findSet(i) == findSet(j);
}

void unionSet(int i, int j){
    if(!isSameSet(i, j)){
        int x = findSet(i);
        int y = findSet(j);
        if(rank1[x] > rank1[y]){
            p[y] = x;
        }else{
            p[x] = y;
            if(rank1[x] == rank1[y]){rank1[y] ++;}
        }
    }
}

int main(){
    int N;
    scanf("%d", &N);

    for(int i = 0; i < N; i ++){
        scanf("%d%d", &R[i], &C[i]);
    }

    int cnt = 0;
    for(int i = 0; i < N; i ++){
        for(int j = i+1; j < N; j ++){
            if((R[i] < R[j] && C[i] < C[j]) || (R[i] > R[j] && C[i] > C[j])){
                AdjList[i].push_back(j);
                AdjList[j].push_back(i);
                EdgeList[cnt ++] = ii(i, j);
            }
        }
    }

    random_shuffle(EdgeList, EdgeList+cnt); // prevent worst-case time complexity
    init(N);
    int taken = 0;
    for(int i = 0; i < cnt && taken < N-1; i ++){
        int u = EdgeList[i].first;
        int v = EdgeList[i].second;
        if(!isSameSet(u, v) || taken >= N-1){
            unionSet(u, v);
            AdjList2[u].push_back(v);
            AdjList2[v].push_back(u);
            taken ++;
        }
    }

    random_shuffle(EdgeList, EdgeList+cnt);
    for(int i = 0; i < 2*N; i ++){
        int u = EdgeList[i].first;
        int v = EdgeList[i].second;
        if(1){
            unionSet(u, v);
            AdjList2[u].push_back(v);
            AdjList2[v].push_back(u);
            taken ++;
        }
    }

    for(int i = 0; i < N; i ++){
        long long ans = 0;
        memset(dist, -1, sizeof(dist));
        queue<int> q;
        q.push(i);
        dist[i] = 0;
        while(!q.empty()){
            int u = q.front(); q.pop();
            for(int v: AdjList2[u]){
                if(dist[v] == -1){
                    dist[v] = dist[u] + 1;
                    q.push(v);
                }
            }
        }
        for(int j = 0; j < N; j ++){
            ans += dist[j];
        }
        printf("%lld\n", ans);
    }
}

Compilation message (stderr)

adriatic.cpp: In function 'int main()':
adriatic.cpp:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &N);
     ~~~~~^~~~~~~~~~
adriatic.cpp:53:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &R[i], &C[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 10
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20