제출 #417238

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
417238		maomao90	Event Hopping 2 (JOI21_event2)	C++17	0 / 100	70 ms	17264 KiB

event2

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

template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
#define REP(i, s, e) for (int i = s; i < e; i++)
#define RREP(i, s, e) for (int i = s; i >= e; i--)
typedef long long ll;
typedef long double ld;
#define MP make_pair
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
#define MT make_tuple
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define pb emplace_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;

#define INF 1000000005
#define LINF 1000000000000000005
#define MOD 1000000007
#define MAXN 200005

int n, k;
ii lr[MAXN];
vi events;
map<int, int> mp;
vi adj[MAXN];
vi ans;

int d[MAXN], p[MAXN];;
void dfs(int u) {
	for (int v : adj[u]) {
		d[v] = d[u] + 1;
		p[v] = u;
		dfs(v);
	}
}

int main() {
	scanf("%d%d", &n, &k);
	REP (i, 0, n) {
		scanf("%d%d", &lr[i].FI, &lr[i].SE);
	}
	REP (i, 0, n) {
		if (events.empty() || lr[events.back()].FI != lr[i].FI ||
				lr[events.back()].SE > lr[i].SE) {
			mp[lr[i].FI] = events.size();
			events.pb(i);
		}
	}
	mp[INF] = events.size();
	REP (i, 0, events.size()) {
		int r = lr[events[i]].SE;
		int nxt = mp.lower_bound(r) -> SE;
		adj[nxt].pb(i);
	}
	dfs(events.size());
	for (auto asd : mp) {
		if (asd.FI == INF) break;
		int i = asd.SE;
		bool pos = 1;
		while (1) {
			if (k == 0) break;
			int l = lr[events[i]].FI;
			for (; i >= 0 && lr[events[i]].FI == l; i--) {
				if (d[i] < k) {
					i++;
					if (i >= events.size() || lr[events[i]].FI != l) {
						pos = 0;
						break;
					}
					ans.pb(events[i]);
					i = p[i];
					break;
				}
			}
			if (!pos) break;
			if (i < 0 || lr[events[i]].FI <= l) {
				i++;
				ans.pb(events[i]);
				i = p[i];
			}
			k--;
		}
		if (pos) break;
	}
	if (ans.empty()) {
		printf("-1\n");
		return 0;
	}
	for (int i : ans) {
		printf("%d\n", i + 1);
	}
	return 0;
}

/*
4 2
1 4
3 5
4 9
7 10

12 3
1 4
1 8
1 3
1 2
1 4
3 8
3 5
3 9
6 11
6 10
6 12
6 7

6 1
1 7
2 5
2 4
4 8
4 7
8 9
*/

컴파일 시 표준 에러 (stderr) 메시지

event2.cpp: In function 'int main()':
event2.cpp:8:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 | #define REP(i, s, e) for (int i = s; i < e; i++)
......
   59 |  REP (i, 0, events.size()) {
      |       ~~~~~~~~~~~~~~~~~~~               
event2.cpp:59:2: note: in expansion of macro 'REP'
   59 |  REP (i, 0, events.size()) {
      |  ^~~
event2.cpp:75:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |      if (i >= events.size() || lr[events[i]].FI != l) {
      |          ~~^~~~~~~~~~~~~~~~
event2.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
event2.cpp:49:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |   scanf("%d%d", &lr[i].FI, &lr[i].SE);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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