#include<bits/stdc++.h> using namespace std; // define #define execute cerr << " Time: " << fixed << setprecision(6) << (1.0 * clock() / CLOCKS_PER_SEC) << "s\n"; #define ll long long #define ii pair <int , int> #define iii pair <int , ii> #define se second #define fi first #define all(v) (v).begin() , (v).end() #define Unique(v) sort(all(v)) , v.resize(unique(all(v)) - v.begin()) #define bit(x,i) (((x) >> (i)) & 1LL) #define flip(x,i) ((x) ^ (1LL << (i))) #define ms(d,x) memset(d , x , sizeof(d)) #define exist __exist #define ends __ends #define visit visited #define left __left #define right __right #define prev __prev #define next __next #define sitingfake 1 #define orz 1 //constant const long long mod = 1e9 + 7; const long long linf = 4557430888798830399LL; const long long nlinf = -4485090715960753727LL; const int inf = 1061109567; const int ninf = -1044266559; const int dx[] = {0 , -1 , 0 , 1}; const int dy[] = {-1 , 0 , 1 , 0}; template<typename T> bool maximize(T &a, const T &b) { if(a < b) {a = b; return 1;} return 0; } template<typename T> bool minimize(T &a, const T &b) { if(a > b) {a = b; return 1;} return 0; } void Plus(ll & a ,ll b) { b %= mod; a += b; if(a < 0) a += mod; a %= mod; return; } void Mul(ll & a, ll b) { (a *= (b % mod)) %= mod; return; } //code const int maxn = 2e5 + 8; int l[maxn] , r[maxn] , x[maxn]; int n , q; namespace subtask4 { map <int , vector <iii>> adj[2501]; int dist[2501][2501]; void Build() { for(int left = 1; left <= n; left++) { int Mi = inf , Mx = -inf; for(int right = left; right <= n; right++) { Mi = min(Mi , l[right]); Mx = max(Mx , r[right]); if(left < right) { adj[left + 1][right].push_back({0 , {left , right}}); adj[left][right - 1].push_back({0 , {left , right}}); adj[Mi][right].push_back({1 , {left , right}}); adj[left][Mx].push_back({1 , {left , right}}); } else { adj[Mi][Mx].push_back({1 , {left , right}}); } } } } void solve() { Build(); ms(dist , 0x3f); deque <ii> dq; dq.push_back({1 , n}); dist[1][n] = 0; while(!dq.empty()) { int u = dq.front().fi; int v = dq.front().se; dq.pop_front(); for(iii it : adj[u][v]) { int x = it.se.fi; int y = it.se.se; int w = it.fi; if(minimize(dist[x][y] , dist[u][v] + w)) { if(w) { dq.push_back({x , y}); } else dq.push_front({x , y}); } } } for(int i = 1; i <= q; i++) { if(dist[x[i]][x[i]] == inf) { cout << -1 << "\n"; } else cout << dist[x[i]][x[i]] << "\n"; } } } void solve(void) { cin >> n; for(int i = 1; i <= n; i++) { cin >> l[i] >> r[i]; } cin >> q; for(int i = 1; i <= q; i++) { cin >> x[i]; } subtask4 :: solve(); } /** **/ signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define task "" if(fopen(task".inp","r")) { freopen(task".inp","r",stdin); freopen(task".out","w",stdout); } int tc = 1; // cin >> tc; while(tc--) solve(); // execute; }

passport.cpp: In function 'int main()':
passport.cpp:161:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  161 |        freopen(task".inp","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
passport.cpp:162:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  162 |        freopen(task".out","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~