Submission #42364

#	Time	Username	Problem	Language	Result	Execution time	Memory
42364		nickyrio	버스 (JOI14_bus)	C++14	35 / 100	1072 ms	35372 KiB

bus

#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = a; i<= b; ++i)
#define FORD(i, a, b) for (int i = a; i>=b; --i)
#define REP(i, a) for (int i = 0; i<a; ++i)
#define DEBUG(x) { cerr << #x << " = " << x << endl; }
#define Arr(A, l, r) { cerr << #A  << " = "; FOR(_, l, r) cerr << A[_] << ' '; cerr << endl; }
#define N 1001000
#define pp pair<int, int>
#define next __next
#define prev __prev
#define __builtin_popcount __builtin_popcountll
#define bit(S, i) (((S) >> i) & 1)
#define IO ios::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL);

using namespace std;

struct edge {
    int a, b, x, y;
}g[N];
vector<int> e[N];
int d[N], visited[N];
int n, m;

void Enter() {
  	IO;
    cin >> n >> m;
    REP(i, m) {
        cin >> g[i].a >> g[i].b >> g[i].x >> g[i].y;
        e[g[i].a].push_back(i);
    }
}
bool disabled[N];

void dfs(int u, int isEdge, int MAX, int now) {
    if (isEdge) {
        visited[u] = true;
        d[u] = MAX;
        if (!disabled[g[u].b]) dfs(g[u].b, 0, MAX, now);
    }
    else {
      	bool stop = true;
        for (int id : e[u]) {
            if (visited[id] == false) {
                if (g[id].x >= now) {
                    dfs(id, 1, MAX, g[id].y);
                }
              	stop = false;
            }
        }
      if (stop) disabled[u] = true;
    }
}

vector<pp> res;

void Process() {
    sort(e[1].begin(), e[1].end(), [] (const int &a, const int &b) {
         return g[a].x > g[b].x;
    });
    for (int id : e[1]) {
        if (visited[id] == false) {
            dfs(id, 1, g[id].x, g[id].y);
        }
    }
    REP(i, m) {
        if (g[i].b == n && visited[i]) {
            res.push_back(pp(g[i].y, d[i]));
        }
    }
    sort(res.begin(), res.end());
    REP(i, res.size()) if (i) {
        res[i].second = max(res[i].second, res[i - 1].second);
    }
}

void Query() {
    int q;
    cin >> q;
    REP(i, q) {
        int x;
        cin >> x;
        int pos = upper_bound(res.begin(), res.end(), pp(x + 1, -1)) - res.begin() - 1;
        if (pos < 0) cout << -1 << '\n';
        else cout << res[pos].second << '\n';
    }
}
int main() {
    Enter();
    Process();
    Query();
}

Compilation message (stderr)

bus.cpp: In function 'void Process()':
bus.cpp:4:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define REP(i, a) for (int i = 0; i<a; ++i)
                                    ^
bus.cpp:71:5: note: in expansion of macro 'REP'
     REP(i, res.size()) if (i) {
     ^

• Subtask 1: 20 / 20
• Subtask 2: 15 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 50