oj.uz

Submission #802540

# Submission time Handle Problem Language Result Execution time Memory
802540 2023-08-02T12:42:43 Z KN200711 Watching (JOI13_watching) C++14
50 / 100
 1000 ms 16000 KB 
# include <bits/stdc++.h>
# define ll long long
using namespace std;

int N, P, Q;
vector<int> arr;

int mn[2001][2001];
int edge[2][2001];

bool cek(int a) {
	// set edge nya dulu
	for(int i=0;i<N;i++) {
		int T = arr[i] + a - 1;
		edge[0][i] = upper_bound(arr.begin(), arr.end(), T) - arr.begin();
		T += a;
		edge[1][i] = upper_bound(arr.begin(), arr.end(), T) - arr.begin();
		
	//	if(a == 4) cout<<i<<" "<<edge[0][i]<<" "<<edge[1][i]<<endl;
	}
	
	if(P < Q) {
		for(int d=0;d<=N;d++) {
			for(int a=0;a<=P;a++) mn[d][a] = 1e9;
		}
		priority_queue< pair<int, pair<int, int> > > PQ;
		PQ.push(make_pair(0, make_pair(0, 0)));
		
		while(!PQ.empty()) {
			int x, y, z;
			x = PQ.top().second.first;
			y = PQ.top().second.second;
			z = PQ.top().first;
			PQ.pop();
			if(-z > Q) continue;
			if(mn[x][-y] != 1e9) continue;
		//	if(a == 1) cout<<x<<" "<<y<<" "<<z<<endl;
			mn[x][-y] = z;
			if(x == N) return 1;
			
			PQ.push(make_pair(z, make_pair(edge[0][x], y-1)));
			PQ.push(make_pair(z-1, make_pair(edge[1][x], y)));
		}
		return 0;
	} else {
		for(int d=0;d<=N;d++) {
			for(int a=0;a<=Q;a++) mn[d][a] = 1e9;
		}
		priority_queue< pair<int, pair<int, int> > > PQ;
		PQ.push(make_pair(0, make_pair(0, 0)));
		
		while(!PQ.empty()) {
			int x, y, z;
			x = PQ.top().second.first;
			y = PQ.top().second.second;
			z = PQ.top().first;
			PQ.pop();
			if(-z > P || -y > P) continue;
			if(mn[x][-y] != 1e9) continue;
		//	if(a == 1) cout<<x<<" "<<y<<" "<<z<<endl;
			mn[x][-y] = z;
			if(x == N) return 1;
			
			PQ.push(make_pair(z, make_pair(edge[1][x], y-1)));
			PQ.push(make_pair(z-1, make_pair(edge[0][x], y)));
		}
		return 0;
	}
	for(int d=0;d<=N;d++) {
		for(int a=0;a<=P;a++) mn[d][a] = 1e9;
	}
	priority_queue< pair<int, pair<int, int> > > PQ;
	PQ.push(make_pair(0, make_pair(0, 0)));
	
	while(!PQ.empty()) {
		int x, y, z;
		x = PQ.top().second.second;
		y = PQ.top().second.first;
		z = PQ.top().first;
		PQ.pop();
		if(-z > Q || -y > P) continue;
		if(mn[x][-y] != 1e9) continue;
	//	if(a == 1) cout<<x<<" "<<y<<" "<<z<<endl;
		mn[x][-y] = z;
		if(x == N) return 1;
		
		PQ.push(make_pair(z, make_pair(edge[0][x], y - 1)));
		PQ.push(make_pair(z-1, make_pair(edge[1][x], y)));
	}
	return 0;
}

int main() {
	scanf("%d %d %d", &N, &P, &Q);
	arr.resize(N);
	for(int i=0;i<N;i++) scanf("%d", &arr[i]);
	sort(arr.begin(), arr.end());
	
	if(P + Q >= N) {
		printf("1\n");
		return 0;
	}
	
//	cout<<cek(4)<<endl;
	int l = 1, r = 1e9, ans = -1;
	while(l <= r) {
		int mid = (l + r) / 2;
		if(cek(mid)) {
			ans = mid;
			r = mid - 1;
		} else l = mid + 1;
	}
	printf("%d\n", ans);
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:94:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |  scanf("%d %d %d", &N, &P, &Q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:96:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |  for(int i=0;i<N;i++) scanf("%d", &arr[i]);
      |                       ~~~~~^~~~~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 2 ms 596 KB Output is correct
10 Correct 3 ms 692 KB Output is correct
11 Correct 2 ms 724 KB Output is correct
12 Correct 5 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 724 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8276 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 8 ms 8404 KB Output is correct
8 Correct 318 ms 9320 KB Output is correct
9 Correct 268 ms 9328 KB Output is correct
10 Correct 310 ms 9044 KB Output is correct
11 Correct 367 ms 9044 KB Output is correct
12 Execution timed out 1084 ms 16000 KB Time limit exceeded
13 Halted 0 ms 0 KB -