Submission #406850

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
406850	2021-05-18T06:15:02 Z	8e7	Toy Train (IOI17_train)	C++14	Compilation error	0 ms	0 KB

train

#include "train.h"

//Challenge: Accepted
#include <iostream>
#include <algorithm>
#include <vector>
#include <utility>
#define ll long long
#define maxn 5005
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
using namespace std;
vector<int> adj[maxn], rev[maxn], scc[maxn];
bool found[maxn], poss[maxn], tag[maxn], b[maxn]; 
int group[maxn];
int ord[maxn];
int ti = 0;
void dfs(int n) {
	found[n] = 1;
	for (int v:adj[n]) {
		if (!found[v] && !b[i]) {
			dfs(v);
		}
	}

	ord[ti++] = n;
}
bool self[maxn];
vector<int> node;
void dfs2(int n) {
	node.push_back(n);
	found[n] = 1;
	for (int v:rev[n]) {
		if (!found[v] && !b[v]) dfs2(v);
	}
}
bool dfs3(int n) {
	found[n] = 1;
	if (tag[n]) return true;
	bool ret = false;
	for (int v:adj[n]) {
		if (!found[v]) ret |= dfs3(v);
	}
	return ret;
}
std::vector<int> who_wins(std::vector<int> a, std::vector<int> r, std::vector<int> u, std::vector<int> v) {
	int n = a.size(), m = u.size();
	for (int i = 0;i < m;i++) {
		adj[u[i]].push_back(v[i]);
		rev[v[i]].push_back(u[i]);
		if (u[i] == v[i]) self[u[i]] = 1;
	}
	for (int i = 0;i < n;i++) b[i] = r[i];
	for (int i = 0;i < n;i++) {
		if (!found[i] && !b[i]) dfs(i);
	}
	for (int i = 0;i < n;i++) found[i] = 0;
	int cnt = 0;
	for (int i = ti - 1;i >= 0;i--) {
		if (!found[ord[i]]) {
			node.clear();
			dfs2(ord[i]);
			if(node.size() > 1 || (node.size() == 1 && self[ord[i]])) {
				for (int j:node) tag[j] = 1;
			}
			for (int j:node) group[j] = cnt;
			cnt++;
		}
	}	
	vector<int> ret;
	for (int i = 0;i < n;i++) {
		for (int j = 0;j < n;j++) found[j] = 0;
		bool res = dfs3(i);
		ret.push_back(res ? 1 : 0);
	}
	return ret;
}

Compilation message

train.cpp: In function 'void dfs(int)':
train.cpp:23:23: error: 'i' was not declared in this scope
   23 |   if (!found[v] && !b[i]) {
      |                       ^