Submission #893197

#	Time	Username	Problem	Language	Result	Execution time	Memory
893197		AgentPengin	버스 (JOI14_bus)	C++14	100 / 100	155 ms	39260 KiB

bus

/**
 *    author:  AgentPengin ( Độc cô cầu bại )
 *    created: 23.12.2022 10:08:02
 *    too lazy to update time
**/
#include<bits/stdc++.h>

#define EL '\n'
#define fi first
#define se second
#define NAME "TASK"
#define ll long long
#define lcm(a,b) (a/gcd(a,b))*b
#define db(val) "["#val" = " << (val) << "] "
#define bend(v) (v).begin(),(v).end()
#define sz(v) (int)(v).size()
#define ex exit(0)

using namespace std;

const ll mod = 1e9 + 7;
const int inf = 0x1FFFFFFF;
const int MAXN = 5e5 + 5;
const int MAXM = 5e5 + 5;

struct Info {
	int u,t,id,type;
	bool operator < (const Info &other) const {
		if (t != other.t) return t < other.t;
		else return type < other.type;
	}
};

vector<Info> v;
int n,m,mx[MAXN],d[MAXN];
vector<pair<int,int>> dd[MAXN];

signed main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if (ifstream(NAME".inp")) {
        freopen(NAME".inp","r",stdin);
        freopen(NAME".out","w",stdout);
    }
    cin >> n >> m;
    for (int i = 1;i <= m;i++) {
    	int u,V,s,t;
    	cin >> u >> V >> s >> t;
    	v.push_back({u,s,i,1});
    	v.push_back({V,t,i,0});
    }
    sort(bend(v));
    for (int i = 1;i <= n;i++) mx[i] = -1;
    for (auto x : v) {
    	if (x.type == 1) {
    		if (x.u == 1) d[x.id] = x.t;
    		else d[x.id] = mx[x.u];
    	} else {
    		if (d[x.id] != -1) {
    			dd[x.u].emplace_back(x.t,d[x.id]);
    			mx[x.u] = max(mx[x.u],d[x.id]);
    		}
    	}
    }
    for (int i = 1;i < sz(dd[n]);i++) dd[n][i].se = max(dd[n][i].se,dd[n][i - 1].se);
    int q; cin >> q;
    while(q--) {
    	int x; cin >> x;
    	int k = upper_bound(bend(dd[n]),make_pair(x,inf)) - dd[n].begin() - 1;
    	if (k == -1) cout << k << EL;
    	else cout << dd[n][k].se << EL;
    }
    
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}
// agent pengin wants to take apio (with anya-san)

Compilation message (stderr)

bus.cpp: In function 'int main()':
bus.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen(NAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bus.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen(NAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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