oj.uz

Submission #1105187

# Submission time Handle Problem Language Result Execution time Memory
1105187 2024-10-25T16:17:30 Z alexander707070 Toy Train (IOI17_train) C++14
21 / 100
 97 ms 151604 KB 
#include<bits/stdc++.h>
#define MAXN 1000007
using namespace std;
 
int n;
bool is[MAXN],sp[MAXN],ok[MAXN],li[MAXN],dp[MAXN],primka[MAXN];
vector<int> v[MAXN],r[MAXN],ans,g[MAXN];
int tim[MAXN],comp[MAXN],k,sz[MAXN];
bool ban[MAXN],dead[MAXN];
stack<int> st;

void dfs(int x){
	li[x]=true;

	for(int i:v[x]){
		if(!li[i] and !ban[i])dfs(i);
	}

	st.push(x);
}

void scc(int x){
	li[x]=true;
	comp[x]=k; sz[k]++;

	if(sp[x] or dead[x])ok[k]=true;

	for(int i:r[x]){
		if(!li[i] and !ban[i])scc(i);
	}
}

bool ff(int x){
	if(li[x])return dp[x];
	li[x]=true;

	dp[x]=ok[x];
	for(int i:g[x]){
		if(ff(i))dp[x]=true;
	}

	return dp[x];
}
 
bool brute(int x,int last,int t){
	tim[x]=t;
	if(sp[x])last=t;
 
	for(int i=0;i<v[x].size();i++){
		if(is[x]){
			if(tim[v[x][i]]!=0 and tim[v[x][i]]<=last){
				tim[x]=0; return true;
			}
		}else{
			if(tim[v[x][i]]!=0 and tim[v[x][i]]>last){
				tim[x]=0; return false;
			}
		}
	}
 
	for(int i=0;i<v[x].size();i++){
		if(tim[v[x][i]]!=0)continue;
 
		if(is[x]){
			if(brute(v[x][i],last,t+1)){
				tim[x]=0; return true;
			}
		}else{
			if(!brute(v[x][i],last,t+1)){
				tim[x]=0; return false;
			}
		}
	}
 
	tim[x]=0;
	return !is[x];
}
 
vector<int> who_wins(vector<int> A,vector<int> R, vector<int> from,vector<int> to){
	n=int(A.size());
	
	int mins=1,maxs=0;
	for(int i=1;i<=n;i++){
		is[i]=A[i-1];

		mins=min(mins,int(is[i]));
		maxs=max(maxs,int(is[i]));

		sp[i]=R[i-1];
	}
 
	for(int i=1;i<=from.size();i++){
		from[i-1]++; to[i-1]++;

		v[from[i-1]].push_back(to[i-1]);
		r[to[i-1]].push_back(from[i-1]);

		if(from[i-1]==to[i-1])primka[from[i-1]]=true;
	}
 
	if(n<=15){
		for(int i=1;i<=n;i++){
			for(int f=1;f<=n;f++)tim[f]=0;
 
			if(brute(i,0,1))ans.push_back(1);
			else ans.push_back(0);
		}
	}else{
		if(mins==maxs and mins==1){

			for(int i=1;i<=n;i++){
				if(li[i])continue;
				dfs(i);
			}
 
			for(int i=1;i<=n;i++)li[i]=false;
 
			while(!st.empty()){
				if(!li[st.top()]){
					k++; scc(st.top());
 
					if(sz[k]==1 and !primka[st.top()])ok[k]=false;
				}
				st.pop();
			}
 
			for(int i=1;i<=from.size();i++){
				if(comp[from[i-1]]==comp[to[i-1]])continue;
				g[comp[from[i-1]]].push_back(comp[to[i-1]]);
			}
 
			for(int i=1;i<=n;i++)li[i]=false;
 
			for(int i=1;i<=n;i++){
				if(ff(comp[i]))ans.push_back(1);
				else ans.push_back(0);
			}
			
		}else if(mins==maxs and mins==0){
			cout<<1/0;

			for(int i=1;i<=n;i++){
				if(sp[i])ban[i]=true;
			}

			for(int i=1;i<=n;i++){
				if(li[i] or ban[i])continue;
				dfs(i);
			}

			for(int i=1;i<=n;i++)li[i]=false;

			while(!st.empty()){
				if(!li[st.top()]){
					k++; scc(st.top());

					if(sz[k]>1 or primka[st.top()])ok[k]=true;
				}
				st.pop();
			}

			for(int i=1;i<=n;i++){
				if(ok[comp[i]])dead[i]=true;
			}

			for(int i=1;i<=n;i++)li[i]=ban[i]=false;

			for(int i=1;i<=n;i++){
				if(li[i])continue;
				dfs(i);
			}

			for(int i=1;i<=n;i++)li[i]=false;

			k=0;
			while(!st.empty()){
				if(!li[st.top()]){
					k++; ok[k]=false;
					
					scc(st.top());
				}
				st.pop();
			}

			for(int i=1;i<=from.size();i++){
				if(comp[from[i-1]]==comp[to[i-1]])continue;
				g[comp[from[i-1]]].push_back(comp[to[i-1]]);
			}

			for(int i=1;i<=n;i++)li[i]=false;

			for(int i=1;i<=n;i++){
				if(ff(comp[i]))ans.push_back(0);
				else ans.push_back(1);
			}
		}
	}
 
	return ans;
}
 
/*int main(){
 
	ans=who_wins({0, 0}, {1,0}, {0, 0, 1, 1}, {0, 1, 0, 1});
 
	for(int i:ans)cout<<i<<" ";
 
	return 0;
}*/

Compilation message

train.cpp: In function 'bool brute(int, int, int)':
train.cpp:49:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |  for(int i=0;i<v[x].size();i++){
      |              ~^~~~~~~~~~~~
train.cpp:61:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |  for(int i=0;i<v[x].size();i++){
      |              ~^~~~~~~~~~~~
train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:92:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |  for(int i=1;i<=from.size();i++){
      |              ~^~~~~~~~~~~~~
train.cpp:127:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  127 |    for(int i=1;i<=from.size();i++){
      |                ~^~~~~~~~~~~~~
train.cpp:140:11: warning: division by zero [-Wdiv-by-zero]
  140 |    cout<<1/0;
      |          ~^~
train.cpp:185:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  185 |    for(int i=1;i<=from.size();i++){
      |                ~^~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 74576 KB WA in grader: Wrong returned array size
2 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 76368 KB Output is correct
2 Correct 14 ms 76368 KB Output is correct
3 Correct 13 ms 76368 KB Output is correct
4 Correct 14 ms 76368 KB Output is correct
5 Correct 14 ms 76368 KB Output is correct
6 Correct 17 ms 76380 KB Output is correct
7 Correct 13 ms 76368 KB Output is correct
8 Correct 13 ms 76380 KB Output is correct
9 Correct 14 ms 76232 KB Output is correct
10 Correct 14 ms 76368 KB Output is correct
11 Correct 13 ms 76252 KB Output is correct
12 Correct 12 ms 76368 KB Output is correct
13 Correct 12 ms 76368 KB Output is correct
14 Correct 12 ms 76536 KB Output is correct
15 Correct 13 ms 76368 KB Output is correct
16 Correct 13 ms 76368 KB Output is correct
17 Correct 14 ms 76292 KB Output is correct
18 Correct 12 ms 76368 KB Output is correct
19 Correct 12 ms 76392 KB Output is correct
20 Correct 13 ms 76368 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 77528 KB Output is correct
2 Correct 17 ms 77648 KB Output is correct
3 Correct 19 ms 77648 KB Output is correct
4 Correct 18 ms 77648 KB Output is correct
5 Correct 18 ms 77392 KB Output is correct
6 Correct 18 ms 77560 KB Output is correct
7 Correct 21 ms 77136 KB Output is correct
8 Correct 18 ms 77136 KB Output is correct
9 Correct 17 ms 77352 KB Output is correct
10 Correct 18 ms 77392 KB Output is correct
11 Correct 18 ms 77528 KB Output is correct
12 Correct 18 ms 77372 KB Output is correct
13 Correct 18 ms 77532 KB Output is correct
14 Correct 18 ms 77392 KB Output is correct
15 Correct 18 ms 77648 KB Output is correct
16 Correct 18 ms 77392 KB Output is correct
17 Correct 18 ms 77392 KB Output is correct
18 Correct 16 ms 77136 KB Output is correct

Subtask #4
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 97 ms 151604 KB Execution killed with signal 4
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 20 ms 75088 KB WA in grader: Wrong returned array size
2 Halted 0 ms 0 KB -

Subtask #6
0 / 51.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 74576 KB WA in grader: Wrong returned array size
2 Halted 0 ms 0 KB -