#include <bits/stdc++.h> using namespace std; typedef long long ll; template <class A, class B> bool maximize(A &a, const B b) { if (a < b) { a = b; return true; } return false; } template <class A, class B> bool minimize(A &a, const B b) { if(a > b) { a = b; return true; } return false; } using pII = pair <int, int>; using vI = vector <int>; using vL = vector <long long>; using pLI = pair <long long, int>; #define BIT(mask, i) ((mask >> (i)) & 1) #define MASK(a) (1LL<<(a)) #define FOR(i, a, b) for(int i = a; i <= (int)b; i++) #define FORD(i, a, b) for(int i = a; i >= (int)b; i--) #define fi first #define se second #define pb push_back #define all(a) a.begin(), a.end() #define sz(a) (int)a.size() const int mod = 1e9 + 7; const int maxn = 2e5 + 5; int n, m, q; map <int, vector <int>> g; ll dist[3005]; int calc(int x, int y) { return min(abs(x - y), 2 * n - abs(x - y)); } void process () { cin >> n >> m >> q; FOR(i, 1, m) { int x; cin >> x; g[x].push_back(n + x); } while(q--) { int st, ed; cin >> st >> ed; priority_queue <pLI, vector <pLI>, greater <pLI>> pq; FOR(i, 0, 2 * n - 1) dist[i] = 1e18; pq.push({dist[st] = 0, st}); while(sz(pq)) { auto [cost, u] = pq.top(); pq.pop(); if(cost > dist[u]) continue; for(int v : g[u]) if(dist[v] > cost + 1) { dist[v] = cost + 1; pq.push({dist[v], v}); } if(1) { int v = (u - 1 + 2 * n) % (2 * n); if(dist[v] > cost + 1) { dist[v] = cost + 1; pq.push({dist[v], v}); } } if(1) { int v = (u + 1) % (2 * n); if(dist[v] > cost + 1) { dist[v] = cost + 1; pq.push({dist[v], v}); } } } cout << dist[ed] << "\n"; } } int main () { ios_base::sync_with_stdio(0); cin.tie(0); #define taskname "kieuoanh" if (fopen(taskname".inp", "r")) { freopen(taskname".inp", "r", stdin); freopen(taskname".out", "w", stdout); } int tc = 1; /// cin >> tc; while (tc--) process(); return 0; }

Main.cpp: In function 'int main()':
Main.cpp:97:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   97 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:98:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~