oj.uz

Submission #226824

# Submission time Handle Problem Language Result Execution time Memory
226824 2020-04-25T14:00:37 Z stefdasca One-Way Streets (CEOI17_oneway) C++14
100 / 100
 129 ms 19964 KB 
#include<bits/stdc++.h>
#define god dimasi5eks
#pragma GCC optimize("O3")
#define fi first
#define se second
#define pb push_back
#define pf push_front
 
// #define fisier 1
 
using namespace std;
 
typedef long long ll;
 
const int mod = 1000000007;
const double dancila = 3.14159265359; // PI 
const double eps = 1e-9;
 
 
int n, m, lvl[100002], low[100002], viz[100002];
vector<pair<int, int> > v[100002], v2[100002];
 
pair<int, int> E[100002];
int ans[100002];
void dfs(int dad, int nod)
{
	viz[nod] = 1;
	low[nod] = lvl[nod];
	for(auto vecin : v[nod])
	{
		if(vecin.se == dad)
			continue;
		if(viz[vecin.fi])
		{
			low[nod] = min(low[nod], lvl[vecin.fi]);
			ans[vecin.se] = 1;
			continue;
		}
		lvl[vecin.fi] = lvl[nod] + 1;
		dfs(vecin.se, vecin.fi);
		if(low[vecin.fi] <= lvl[nod])
			ans[vecin.se] = 1;
		low[nod] = min(low[nod], low[vecin.fi]);
	}
}
 
int bcc[100002], bcnt;
void dfs2(int nod, int col)
{
	bcc[nod] = col;
	for(auto vecin : v[nod])
	{
		if(bcc[vecin.fi]) 
			continue;
		if(ans[vecin.se]) 
			dfs2(vecin.fi, col);
		else
		{
			++bcnt;
			v2[col].push_back({bcnt, vecin.se});
			dfs2(vecin.fi, bcnt);
		}
	}
}
 
int dp[100002];
void dfs3(int nod)
{
	for(auto vecin : v2[nod])
	{
		dfs3(vecin.fi);
		if(dp[vecin.fi]>0)
		{
			int u=E[vecin.se].fi;
			if(bcc[u]==vecin.fi) 
				ans[vecin.se]=2;
			else 
				ans[vecin.se]=3;
		}
		else 
			if(dp[vecin.fi]<0)
			{
				int u=E[vecin.se].fi;
				if(bcc[u]==vecin.fi) 
					ans[vecin.se]=3;
				else 
					ans[vecin.se]=2;
			}
			else 
				ans[vecin.se]=1;
		dp[nod]+=dp[vecin.fi];
	}
}
int main()
{
 
    #ifdef fisier
        ifstream f("input.in");
        ofstream g("output.out");
    #endif
 
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 
	cin >> n >> m;
	for(int i = 1; i <= m; ++i)
	{
	    int a, b;
	    cin >> a >> b;
	    E[i] = {a, b};
	    v[a].pb({b, i});
	    v[b].pb({a, i});
	}
	
	vector<int> rad;
	for(int i = 1; i <= n; ++i)
		if(!viz[i])
		{
			lvl[i] = 1;
			dfs(0, i);
			++bcnt;
			rad.pb(bcnt);
			dfs2(i, bcnt);
		}
	
	int p;
	cin >> p;
	for(; p; --p)
	{
		int a, b;
		cin >> a >> b;
		if(bcc[a] == bcc[b])
			continue;
		++dp[bcc[a]];
		--dp[bcc[b]];
	}
	
	for(auto it : rad) 
		dfs3(it);
	char ch[5] = "XBRL";
	for(int i = 1; i <= m; ++i)
		cout << ch[ans[i]];
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 7 ms 5120 KB Output is correct
4 Correct 8 ms 5248 KB Output is correct
5 Correct 8 ms 5248 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 8 ms 5120 KB Output is correct
8 Correct 8 ms 5248 KB Output is correct
9 Correct 8 ms 5120 KB Output is correct
10 Correct 8 ms 5120 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 7 ms 5120 KB Output is correct
4 Correct 8 ms 5248 KB Output is correct
5 Correct 8 ms 5248 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 8 ms 5120 KB Output is correct
8 Correct 8 ms 5248 KB Output is correct
9 Correct 8 ms 5120 KB Output is correct
10 Correct 8 ms 5120 KB Output is correct
11 Correct 51 ms 11128 KB Output is correct
12 Correct 63 ms 11768 KB Output is correct
13 Correct 61 ms 12792 KB Output is correct
14 Correct 87 ms 13816 KB Output is correct
15 Correct 78 ms 14084 KB Output is correct
16 Correct 77 ms 15096 KB Output is correct
17 Correct 72 ms 16504 KB Output is correct
18 Correct 94 ms 15072 KB Output is correct
19 Correct 72 ms 17272 KB Output is correct
20 Correct 56 ms 11768 KB Output is correct
21 Correct 54 ms 11512 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 7 ms 5120 KB Output is correct
4 Correct 8 ms 5248 KB Output is correct
5 Correct 8 ms 5248 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 8 ms 5120 KB Output is correct
8 Correct 8 ms 5248 KB Output is correct
9 Correct 8 ms 5120 KB Output is correct
10 Correct 8 ms 5120 KB Output is correct
11 Correct 51 ms 11128 KB Output is correct
12 Correct 63 ms 11768 KB Output is correct
13 Correct 61 ms 12792 KB Output is correct
14 Correct 87 ms 13816 KB Output is correct
15 Correct 78 ms 14084 KB Output is correct
16 Correct 77 ms 15096 KB Output is correct
17 Correct 72 ms 16504 KB Output is correct
18 Correct 94 ms 15072 KB Output is correct
19 Correct 72 ms 17272 KB Output is correct
20 Correct 56 ms 11768 KB Output is correct
21 Correct 54 ms 11512 KB Output is correct
22 Correct 94 ms 17528 KB Output is correct
23 Correct 102 ms 16436 KB Output is correct
24 Correct 106 ms 16248 KB Output is correct
25 Correct 111 ms 19964 KB Output is correct
26 Correct 117 ms 17400 KB Output is correct
27 Correct 129 ms 16376 KB Output is correct
28 Correct 41 ms 9588 KB Output is correct
29 Correct 80 ms 12664 KB Output is correct
30 Correct 100 ms 12676 KB Output is correct
31 Correct 83 ms 12920 KB Output is correct
32 Correct 83 ms 15480 KB Output is correct