oj.uz

Submission #892860

# Submission time Handle Problem Language Result Execution time Memory
892860 2023-12-26T05:52:15 Z shoryu386 Trampoline (info1cup20_trampoline) C++17
42 / 100
 957 ms 254800 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long

#define MAXN 100007
vector<int> adj[MAXN];
bitset<MAXN> bs[MAXN];
bool vis[MAXN];

void dfs(int u) {
	for(int v: adj[u]) {
		if(!vis[v]) {
			vis[v] = 1;
			dfs(v);
		} 
		bs[u] |= bs[v];
	}
}


main(){
	int r, c, n; cin >> r >> c >> n;
	
	//r and c are useless lmao
	int N = 0;
	map<int, set< pair<int, bool> >> importantPts; int a, b;
	for (int x = 0; x < n; x++){
		cin >> a >> b;
		importantPts[a].insert({b, 1}); //1 indicating green trampoline
		importantPts[a+1].insert({b, 0});
		N++; N++;
	}
	
	int q; cin >> q;
	pair<int, int> starts[q], ends[q]; 
	for (int x = 0; x < q; x++){
		cin >> starts[x].first >> starts[x].second >> ends[x].first >> ends[x].second;
		
		importantPts[ends[x].first].insert({ends[x].second, 0});
		N++;
	}

	map<pair<int, int>, int> coordToNode;
	pair<int, int> hmm[N];
	
	int cnt = 0;
	for (auto y : importantPts){
		for (auto z : y.second){
			coordToNode[{y.first, z.first}] = cnt;
			hmm[cnt] = {y.first, z.first};
			cnt++;
		}
	}
	
	for (auto y : importantPts){ //gen DAG
	
		pair<int, int> lastCoords = {-1, -1};
	
		for (auto z : y.second){
			if (lastCoords.first != -1) adj[coordToNode[lastCoords]].push_back(coordToNode[{y.first, z.first}]);
			
			if (z.second){
				adj[coordToNode[{y.first, z.first}]].push_back(coordToNode[{y.first+1, z.first}]);
			}
			lastCoords = {y.first, z.first};
		}
	}
	
	for (int i = 0; i < N; i++) bs[i][i] = 1;
	for (int i = 0; i < N; i++) {
		if (vis[i]) continue;
		vis[i] = 1;
		dfs(i);
	}
	
	for (int x = 0; x < q; x++){
		auto startTramp = importantPts[starts[x].first].lower_bound({starts[x].second, 0});
		
		if (startTramp == importantPts[starts[x].first].end()){
			cout << "No\n"; continue;
		}
		
		int startF = starts[x].first, startS = startTramp->first;
		if (bs[coordToNode[{startF, startS}]][coordToNode[{ends[x].first, ends[x].second}]]){
			cout << "Yes\n";
		}
		else cout << "No\n";
	}
	
	
	
}

Compilation message

trampoline.cpp:22:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   22 | main(){
      | ^~~~

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 223824 KB 200 token(s): yes count is 21, no count is 179
2 Correct 73 ms 254800 KB 200 token(s): yes count is 70, no count is 130
3 Correct 51 ms 182256 KB 197 token(s): yes count is 25, no count is 172

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 375 ms 64592 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 957 ms 116612 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 191312 KB 5000 token(s): yes count is 3238, no count is 1762
2 Correct 62 ms 191056 KB 5000 token(s): yes count is 3837, no count is 1163
3 Correct 53 ms 191832 KB 5000 token(s): yes count is 4104, no count is 896
4 Correct 66 ms 191612 KB 5000 token(s): yes count is 3934, no count is 1066
5 Correct 62 ms 191312 KB 5000 token(s): yes count is 3384, no count is 1616
6 Correct 66 ms 191648 KB 5000 token(s): yes count is 3390, no count is 1610

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 832 ms 109492 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -