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#include "kollib.h"
#include "message.h"
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<map>
#include<set>
#include<algorithm>
#include<time.h>

typedef long long int64;

using namespace std;

int INSTANCES = 0;
int STUDENTS = 0;
int QUERIES = 0;
int ID = 0;
int SKIP_RAND_BELOW = 1000;
int MAX_INT_QUAN = 10000;
int MAX_AVG_INT_LEN = 10;

typedef struct {
	int node, from, to, qfrom, qto;
} query;

typedef struct {
	vector<int> data;
	vector<query> queue;
	int len, qb, qe;
} smt;

inline int rson(int n) {
	return 1 + (n << 1);
}
inline int lson(int n) {
	return n << 1;
}
inline int par(int n) {
	return n >> 1;
}

inline void smt_init(smt& m, int len) {
	int n = 1;
	while (n < len) {
		n <<= 1;
	}
	m.data.resize(n << 1, 0);
	query q;
	m.queue.resize(100, q);
	m.len = n;
}

inline void smt_set(smt& m, int pos, int val) {
	int cur = m.len + pos;
	m.data[cur] = val;
	cur = par(cur);
	while (cur) {
		m.data[cur] = m.data[lson(cur)] + m.data[rson(cur)];
		cur = par(cur);
	}
}

inline int smt_sum(smt& m, int from, int to) {
	if (from > to) {
		int tmp = from;
		from = to;
		to = tmp;
	}
	int csum = 0;
	query q;
	q.node = 1;
	q.from = 0;
	q.to = m.len - 1;
	q.qfrom = from;
	q.qto = to;
	m.qe = 1;
	m.qb = 0;
	m.queue[0] = q;
	while (m.qe != m.qb) {
		q = m.queue[m.qb];
		++m.qb;
		if (q.to < q.from) {
			continue;
		}
		if (q.qto < q.from || q.qfrom > q.to) {
			continue;
		}
		if (q.qfrom <= q.from && q.qto >= q.to) {
			csum += m.data[q.node];
			continue;
		}
		int mid = q.from + (q.to - q.from) / 2;
		query q2;
		if (q.qfrom <= mid) {
			q2.node = lson(q.node);
			q2.from = q.from;
			q2.to = mid;
			q2.qfrom = q.qfrom;
			q2.qto = min(mid, q.qto);
			m.queue[m.qe] = q2;
			++m.qe;
		}
		if (q.qto >= mid + 1) {
			q2.node = rson(q.node);
			q2.from = mid + 1;
			q2.to = q.to;
			q2.qfrom = max(mid + 1, q.qfrom);
			q2.qto = q.qto;
			m.queue[m.qe] = q2;
			++m.qe;
		}
	}
	return csum;
}

typedef struct {
	int id;
	vector<pair<int, int> > adj;
} border_t;

int main () {
	INSTANCES = NumberOfNodes();
	STUDENTS = NumberOfStudents();
	QUERIES = NumberOfQueries();
	ID = MyNodeId();
	vector<int> b;
	if (ID == 0) {
		set<int> borders;
		for (int i = 0; i < QUERIES; ++i) {
			borders.insert(QueryFrom(i + 1) - 1);
			borders.insert(QueryTo(i + 1) - 1);
		}
		if (STUDENTS > SKIP_RAND_BELOW || borders.size() < 2) {
			int req = max(2, min(MAX_INT_QUAN, STUDENTS / MAX_AVG_INT_LEN));
			srand(time(NULL));
			for (int i = borders.size(); i < req; ++i) {
				int rnd;
				do {
					rnd = rand() % STUDENTS;
				} while (borders.find(rnd) != borders.end());
				borders.insert(rnd);
			}
		}
		b.reserve(borders.size());
		for(set<int>::iterator it = borders.begin(); it != borders.end(); it++) {
			b.push_back(*it);
		}
		sort(b.begin(), b.end());
		for (int i = 1; i < INSTANCES; ++i) {
			PutInt(i, b.size());
			for (int j = 0; j < b.size(); ++j) {
				PutInt(i, b[j]);
			}
			Send(i);
		}
	}
	else {
		Receive(0);
		int n = GetInt(0);
		b.reserve(n);
		for (int i = 0; i < n; ++i) {
			b.push_back(GetInt(0));
		}
	}
	vector<int> results;
	int current = ID;
	while (current < b.size()) {
		int prev = b[current];
		int curr = FirstNeighbor(prev + 1) - 1;
		int dist = 1;
		while (!binary_search(b.begin(), b.end(), curr)) {
			int next = FirstNeighbor(curr + 1) - 1;
			if (next == prev) {
				next = SecondNeighbor(curr + 1) - 1;
			}
			prev = curr;
			curr = next;
			++dist;
		}
		results.push_back(b[current]);
		results.push_back(curr);
		results.push_back(dist);
		prev = b[current];
		curr = SecondNeighbor(prev + 1) - 1;
		dist = 1;
		while (!binary_search(b.begin(), b.end(), curr)) {
			int next = FirstNeighbor(curr + 1) - 1;
			if (next == prev) {
				next = SecondNeighbor(curr + 1) - 1;
			}
			prev = curr;
			curr = next;
			++dist;
		}
		results.push_back(b[current]);
		results.push_back(curr);
		results.push_back(dist);
		current += INSTANCES;
	}
	if (ID) {
		PutInt(0, results.size());
		for (int i = 0; i < results.size(); ++i) {
			PutInt(0, results[i]);
		}
		Send(0);
		return 0;
	}
	map<int, border_t> bmap;
	for (int i = 0; i < b.size(); ++i) {
		border_t bo;
		bo.id = b[i];
		bmap[b[i]] = bo;
	}
	int cur = 0;
	while (cur < results.size()) {
		bmap[results[cur]].adj.push_back(make_pair(results[cur + 1], results[cur + 2]));
		cur += 3;
	}
	for (int i = 1; i < INSTANCES; ++i) {
		Receive(i);
		int n = GetInt(i);
		int cur = 0;
		while (cur < n) {
			int from = GetInt(i);
			int to = GetInt(i);
			int cost = GetInt(i);
			bmap[from].adj.push_back(make_pair(to, cost));
			cur += 3;
		}
	}
	map<int, int> positions;
	smt s;
	smt_init(s, b.size());
	int prev = -1;
	cur = b[0];
	for (int i = 0; i < b.size(); ++i) {
		positions[cur] = i;
		border_t bo = bmap[cur];
		pair<int, int> next = bo.adj[0];
		if (next.first == prev) {
			next = bo.adj[1];
		}
		prev = cur;
		cur = next.first;
		smt_set(s, i, next.second);
	}
	for (int i = 0; i < QUERIES; ++i) {
		int from = QueryFrom(i + 1) - 1;
		int to = QueryTo(i + 1) - 1;
		if (from == to) {
			printf("0\n");
			continue;
		}
		int p1 = positions[from];
		int p2 = positions[to];
		int res = smt_sum(s, min(p1, p2), max(p1, p2) - 1);
		res = min(res, STUDENTS - res);
		printf("%d\n", res);
	}
	return 0;
}