Submission #1279830

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279830		icebear	Passport (JOI23_passport)	C++20	40 / 100	2136 ms	1014504 KiB

passport

// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "gen"
/*END OF TEMPLATE. ICEBEAR AND THE CAT WILL WIN VOI26 */

const int MOD = 1e9 + 7;
const int inf = 1e8 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 2e5 + 5;
int n;
vector<int> G[N], rG[N];
int dist[2][N], dist_any[N];

void BFS(int src, int dist[], const vector<int> *G) {
    queue<int> q;
    FOR(i, 1, n) dist[i] = inf;
    q.push(src);
    dist[src] = 0;
    while(!q.empty()) {
        int u = q.front(); q.pop();
        for(int v : G[u]) if (minimize(dist[v], dist[u] + 1))
            q.push(v);
    }
}

void init(void) {
    cin >> n;
    FOR(i, 1, n) {
        int l, r;
        cin >> l >> r;
        FOR(j, l, r) G[i].pb(j), rG[j].pb(i);
    }
}

void process(void) {
    BFS(1, dist[0], rG);
    BFS(n, dist[1], rG);
    int q; cin >> q;
    while(q--) {
        int u; cin >> u;
        BFS(u, dist_any, G);
        int ans = inf;
        FOR(i, 1, n) minimize(ans, min(inf, dist[0][i] + dist[1][i] + dist_any[i] - (i != 1 && i != n)));
        cout << (ans == inf ? -1 : ans) << '\n';
        cerr << (ans == inf ? -1 : ans) << '\n';
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
        init();
        process();
    }
    return 0;
}

Compilation message (stderr)

passport.cpp: In function 'int main()':
passport.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
passport.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 16 / 16
• Subtask 3: 24 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46