oj.uz

Submission #90618

# Submission time Handle Problem Language Result Execution time Memory
90618 2018-12-22T23:59:19 Z psmao Pipes (BOI13_pipes) C++14
90.9259 / 100
 224 ms 53372 KB 
#include <bits/stdc++.h>
using namespace std;

#define fo(i,s,t) for(int i = s; i <= t; ++ i)
#define fd(i,s,t) for(int i = s; i >= t; -- i)
#define bf(i,s) for(int i = head[s]; i; i = e[i].next)
#define mp make_pair
#define fi first
#define se second
#define pii pair<int,int>
#define pb push_back
#define VI vector<int>
#define sf scanf
#define pf printf
#define fp freopen
#define SZ(x) ((int)(x).size())
#ifdef MPS
#define D(x...) printf(x)
#else
#define D(x...)
#endif
typedef long long ll;
typedef double db;
typedef unsigned long long ull;
const int inf = 1<<30;
const ll INF = 1ll<<60;
const db Inf = 1e20;
const db eps = 1e-9;

void gmax(int &a,int b){a = (a > b ? a : b);}
void gmin(int &a,int b){a = (a < b ? a : b);}

const int maxn = 100050;

int n, m, deg[maxn], s[maxn];
ll v[maxn];
vector<pii> adj[maxn];
queue<int> Q;
VI pathx, nodex;
bool vis[maxn];

int main()
{
	#ifdef MPS
		fp("1.in","r",stdin);
		fp("1.out","w",stdout);
	#endif
	sf("%d%d",&n,&m);
	if(m != n-1 && m != n) return 0 * pf("0\n");
	fo(i,1,n) sf("%d",&s[i]);
	fo(i,1,m) 
	{
		int u, v; sf("%d%d",&u,&v); 
		adj[u].pb(mp(v,i)); 
		adj[v].pb(mp(u,i)); 
		deg[u] ++; deg[v] ++;
	}
	fo(i,1,n) if(deg[i] == 1) Q.push(i);
	while(!Q.empty())
	{
		int h = Q.front(); Q.pop();
		vis[h] = true;
		for(auto p : adj[h]) if(!vis[p.fi])
		{
			v[p.se] = s[h];
			s[p.fi] -= s[h];
			if((--deg[p.fi]) == 1) Q.push(p.fi);
		}
	}
	fo(i,1,n) if(deg[i] == 2)
	{
		int x = i; ll cur = 0ll;
		while(1)
		{
			bool contin = false; deg[x] --;
			cur = s[x] - cur; nodex.pb(x);
			for(auto p : adj[x]) if(deg[p.fi] == 2) {x = p.fi; pathx.pb(p.se); contin = true; break;}
			if(!contin) // we have iterated the cycle already
			{
				for(auto p : adj[x]) if(p.fi == i) {pathx.pb(p.se); break;}
				if(cur&1) return 0 * pf("0\n");
				cur >>= 1;
				v[pathx.back()] = cur;
				for(int p = 0; p < SZ(pathx)-1; ++ p) {cur = s[nodex[p]] - cur; v[pathx[p]] = cur;} 
				break;
			}
		}
		break;
	}
	fo(i,1,m) cout << v[i]*2 << endl;
	return 0;
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:48:4: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  sf("%d%d",&n,&m);
    ^
pipes.cpp:50:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fo(i,1,n) sf("%d",&s[i]);
              ^
pipes.cpp:53:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int u, v; sf("%d%d",&u,&v); 
               ^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 2808 KB Output is correct
2 Correct 4 ms 2912 KB Output is correct
3 Correct 5 ms 3152 KB Output is correct
4 Correct 192 ms 10696 KB Output is correct
5 Correct 3 ms 10696 KB Output is correct
6 Correct 3 ms 10696 KB Output is correct
7 Correct 3 ms 10696 KB Output is correct
8 Correct 3 ms 10696 KB Output is correct
9 Correct 5 ms 10696 KB Output is correct
10 Correct 5 ms 10696 KB Output is correct
11 Correct 5 ms 10696 KB Output is correct
12 Correct 5 ms 10696 KB Output is correct
13 Correct 154 ms 10740 KB Output is correct
14 Correct 185 ms 13260 KB Output is correct
15 Correct 200 ms 15096 KB Output is correct
16 Correct 168 ms 15536 KB Output is correct
17 Correct 195 ms 17920 KB Output is correct
18 Correct 199 ms 19620 KB Output is correct
19 Correct 197 ms 20528 KB Output is correct
20 Correct 4 ms 20528 KB Output is correct
21 Correct 5 ms 20528 KB Output is correct
22 Correct 197 ms 22748 KB Output is correct
23 Correct 161 ms 22812 KB Output is correct
24 Correct 196 ms 25556 KB Output is correct
25 Correct 158 ms 25892 KB Output is correct

Subtask #2
60.9259259259 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 25892 KB Output is correct
2 Correct 5 ms 25892 KB Output is correct
3 Incorrect 182 ms 28296 KB Output isn't correct
4 Correct 4 ms 28296 KB Output is correct
5 Correct 4 ms 28296 KB Output is correct
6 Correct 3 ms 28296 KB Output is correct
7 Correct 4 ms 28296 KB Output is correct
8 Correct 3 ms 28296 KB Output is correct
9 Incorrect 4 ms 28296 KB Output isn't correct
10 Correct 3 ms 28296 KB Output is correct
11 Correct 3 ms 28296 KB Output is correct
12 Correct 3 ms 28296 KB Output is correct
13 Correct 3 ms 28296 KB Output is correct
14 Correct 3 ms 28296 KB Output is correct
15 Correct 5 ms 28296 KB Output is correct
16 Correct 5 ms 28296 KB Output is correct
17 Incorrect 5 ms 28296 KB Output isn't correct
18 Correct 4 ms 28296 KB Output is correct
19 Correct 4 ms 28296 KB Output is correct
20 Correct 3 ms 28296 KB Output is correct
21 Correct 3 ms 28296 KB Output is correct
22 Correct 5 ms 28296 KB Output is correct
23 Correct 157 ms 29092 KB Output is correct
24 Correct 217 ms 31668 KB Output is correct
25 Incorrect 184 ms 32844 KB Output isn't correct
26 Correct 3 ms 32844 KB Output is correct
27 Correct 4 ms 32844 KB Output is correct
28 Correct 4 ms 32844 KB Output is correct
29 Correct 4 ms 32844 KB Output is correct
30 Correct 196 ms 34372 KB Output is correct
31 Correct 224 ms 36452 KB Output is correct
32 Correct 206 ms 37856 KB Output is correct
33 Incorrect 201 ms 39432 KB Output isn't correct
34 Correct 4 ms 39432 KB Output is correct
35 Correct 3 ms 39432 KB Output is correct
36 Correct 3 ms 39432 KB Output is correct
37 Correct 3 ms 39432 KB Output is correct
38 Correct 216 ms 40964 KB Output is correct
39 Correct 210 ms 42564 KB Output is correct
40 Correct 215 ms 44236 KB Output is correct
41 Incorrect 212 ms 45936 KB Output isn't correct
42 Correct 4 ms 45936 KB Output is correct
43 Correct 4 ms 45936 KB Output is correct
44 Correct 4 ms 45936 KB Output is correct
45 Correct 4 ms 45936 KB Output is correct
46 Correct 220 ms 47208 KB Output is correct
47 Correct 217 ms 48984 KB Output is correct
48 Correct 212 ms 50712 KB Output is correct
49 Incorrect 191 ms 51660 KB Output isn't correct
50 Correct 4 ms 51660 KB Output is correct
51 Correct 4 ms 51660 KB Output is correct
52 Correct 3 ms 51660 KB Output is correct
53 Correct 4 ms 51660 KB Output is correct
54 Correct 213 ms 53372 KB Output is correct