Submission #417309

#	Time	Username	Problem	Language	Result	Execution time	Memory
417309		maomao90	Event Hopping 2 (JOI21_event2)	C++17	0 / 100	25 ms	972 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 ans;

int main() {
	scanf("%d%d", &n, &k);
	REP (i, 0, n) {
		scanf("%d%d", &lr[i].FI, &lr[i].SE);
	}
	REP (i, 0, 1 << n) {
		if (__builtin_popcount(i) != k) continue;
		vector<iii> tmp;
		REP (j, 0, n) {
			if (i & (1 << j)) {
				tmp.pb(lr[j].FI, lr[j].SE, j);
			}
		}
		sort(ALL(tmp));
		bool pos = 1;
		REP (j, 1, tmp.size()) {
			auto [l, r, id] = tmp[j];
			auto [pl, pr, pid] = tmp[j - 1];
			if (pr > l) {
				pos = 0;
				break;
			}
		}
		if (pos) {
			vi res;
			for (auto [l, r, id] : tmp) {
				res.pb(id + 1);
			}
			assert(res.size() == k);
			if (ans.empty()) {
				ans = res;
			} else {
				bool toswap = 0;
				REP (j, 0, res.size()) {
					if (res[j] < ans[j]) {
						toswap = 1;
					} else if (res[j] > ans[j]) {
						break;
					}
				}
				if (toswap) {
					ans = res;
				}
			}
		}
	}
	if (ans.empty()) {
		printf("-1\n");
	} else {
		for (int i : ans) {
			printf("%d\n", i);
		}
	}
	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 3
1 7
2 5
2 4
4 8
4 7
8 9

6 4
1 3
1 2
2 4
4 5
5 6
6 7
*/

Compilation message (stderr)

event2.cpp: In function 'int main()':
event2.cpp:8:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::tuple<int, int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 | #define REP(i, s, e) for (int i = s; i < e; i++)
......
   49 |   REP (j, 1, tmp.size()) {
      |        ~~~~~~~~~~~~~~~~                 
event2.cpp:49:3: note: in expansion of macro 'REP'
   49 |   REP (j, 1, tmp.size()) {
      |   ^~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from event2.cpp:1:
event2.cpp:62:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   62 |    assert(res.size() == k);
      |           ~~~~~~~~~~~^~~~
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++)
......
   67 |     REP (j, 0, res.size()) {
      |          ~~~~~~~~~~~~~~~~               
event2.cpp:67:5: note: in expansion of macro 'REP'
   67 |     REP (j, 0, res.size()) {
      |     ^~~
event2.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
event2.cpp:37:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |   scanf("%d%d", &lr[i].FI, &lr[i].SE);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 1
• Subtask 3: 0 / 31
• Subtask 4: 0 / 61