Submission #496937

#	Time	Username	Problem	Language	Result	Execution time	Memory
496937		abc864197532	DEL13 (info1cup18_del13)	C++17	40 / 100	10 ms	2924 KiB

del13

#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define eb emplace_back
#define pb push_back
#define X first
#define Y second
#define pii pair<int,int>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T i, U ...j) {
	cout << i << ' ', abc(j...);
}
template <typename T> void printv(T l, T r) {
	for (; l != r; ++l) 
		cout << *l << " \n"[l + 1 == r];
}
#ifdef Doludu
#define test(x...) abc("[" + string(#x) + "]", x);
#else
#define test(x...) void(0);
#endif
const int N = 1001;
 
int main () {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int t;
	cin >> t;
	while (t--) {
		int n, m;
		cin >> n >> m;
		vector <int> a(m + 1, 0);
		vector <int> rem;
		for (int i = 1; i <= m; ++i) {
			cin >> a[i];
			rem.pb(a[i] - a[i - 1] - 1);
		}
		rem.pb(n - a[m]);
		vector <int> move, fr;
		vector <vector <int>> dp(m + 1, vector <int>(3, false));
		dp[0][0] = true;
		for (int i = 0; i < m; ++i) for (int f = 0; f <= 2; ++f) if (dp[i][f]) {
			int left = rem[i] - f;
			assert(left >= 0);
			if (left == 0) {
				dp[i + 1][0] = true;
				continue;
			}
			if (left & 1) {
				// optimal 1
				if (rem[i + 1] >= 1)
					dp[i + 1][1] = true;
			} else {
				if (f) {
					dp[i + 1][0] = true;
				}
				if (rem[i + 1] >= 2)
					dp[i + 1][2] = true;
			}
		}
		bool is = false;
		for (int i = 1; i <= 2; ++i) 
			is |= dp[m][i] && rem[m] >= i && (rem[m] - i) % 2 == 0;
		is |= dp[m][0] && rem[m] == 0;
		if (is) {
			cout << 0 << endl;
			cout << endl;
		} else {
			cout << -1 << endl;
		}
	}
}

• Subtask 1: 6 / 15
• Subtask 2: 6 / 15
• Subtask 3: 6 / 15
• Subtask 4: 10 / 25
• Subtask 5: 12 / 30