oj.uz

Submission #111629

# Submission time Handle Problem Language Result Execution time Memory
111629 2019-05-15T21:54:09 Z wilwxk Pipes (BOI13_pipes) C++11
74.0741 / 100
 495 ms 27244 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int MAXN=2e5+5;
vector<int> g[MAXN], lista[MAXN];
vector<int> ncyc;
ll v[MAXN], tenho[MAXN];
int gin[MAXN];
ll resp[MAXN], soma;
int n, m;

void poda() {
	queue<int> qu;
	for(int i=1; i<=n; i++) if(gin[i]==1) qu.push(i);
	while(!qu.empty()) {
		int cur=qu.front(); qu.pop();
		gin[cur]=0; ncyc.push_back(cur);
		for(int i=0; i<g[cur].size(); i++) {
			int viz=g[cur][i]; int ind=lista[cur][i];
			if(!gin[viz]) continue;
			gin[viz]--;
			if(gin[viz]<=1) qu.push(viz);
			resp[ind]=v[cur]-tenho[cur];
			tenho[viz]+=resp[ind];
			tenho[cur]+=resp[ind];
			// printf("%d -> %d (%d, %lld)\n", cur, viz, ind, tenho[cur]);
		}
	}
}

void dfs(int cur, int k) {
	// printf("%d %d\n", cur, k);
	gin[cur]=1;
	for(int i=0; i<g[cur].size(); i++) {
		int viz=g[cur][i]; int ind=lista[cur][i];
		if(gin[viz]!=2) continue;
		dfs(viz, k^1);
	}
	if(!k) soma+=v[cur];
	else soma-=v[cur];
}

void solve(int cur, int p) {
	gin[cur]=2;
	for(int i=0; i<g[cur].size(); i++) {
		int viz=g[cur][i]; int ind=lista[cur][i];
		if(viz==p||gin[viz]!=1) continue;
		if(cur==p) resp[ind]=soma;
		else resp[ind]=v[cur]-tenho[cur];
		tenho[viz]+=soma;
		// tenho[cur]+=soma;
		solve(viz, cur);
	}
}

int main() {
	scanf("%d %d", &n, &m);
	for(int i=1; i<=n; i++) scanf("%lld", &v[i]), v[i]*=2;
	for(int i=1; i<=m; i++) {
		int a, b; scanf("%d %d", &a, &b);
		g[a].push_back(b); g[b].push_back(a);
		gin[a]++; gin[b]++;
		lista[a].push_back(i); lista[b].push_back(i);
	}

	poda();
	for(int i=1; i<=n; i++) if(gin[i]) v[i]-=tenho[i], tenho[i]=0;
	// for(int i=1; i<=n; i++) cout << v[i] << endl;

	if(m>n||(n-ncyc.size())%2==0) {
		printf("0\n");
		return 0;
	}
	if(m==n-1&&tenho[ncyc.back()]!=v[ncyc.back()]) {
		printf("0\n");
		return 0;
	}

	for(int i=1; i<=n; i++) {
		if(!gin[i]) continue;
		dfs(i, 0);	
		// printf("ok %lld\n", soma);
		solve(i, i);
		break;
	}

	bool ok=1;
	for(int i=1; i<=n; i++) if(tenho[i]!=v[i]) ok=0;

	if(ok) {
		for(int i=1; i<=m; i++) printf("%lld\n", resp[i]);
	}
	else {
		printf("0\n");
	}

}

Compilation message

pipes.cpp: In function 'void poda()':
pipes.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<g[cur].size(); i++) {
                ~^~~~~~~~~~~~~~
pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<g[cur].size(); i++) {
               ~^~~~~~~~~~~~~~
pipes.cpp:36:26: warning: unused variable 'ind' [-Wunused-variable]
   int viz=g[cur][i]; int ind=lista[cur][i];
                          ^~~
pipes.cpp: In function 'void solve(int, int)':
pipes.cpp:46:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<g[cur].size(); i++) {
               ~^~~~~~~~~~~~~~
pipes.cpp: In function 'int main()':
pipes.cpp:58:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
pipes.cpp:59:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1; i<=n; i++) scanf("%lld", &v[i]), v[i]*=2;
                          ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
pipes.cpp:61:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b; scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 9728 KB Output is correct
2 Correct 10 ms 9728 KB Output is correct
3 Correct 13 ms 9856 KB Output is correct
4 Correct 147 ms 20132 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 9 ms 9728 KB Output is correct
7 Correct 9 ms 9728 KB Output is correct
8 Correct 9 ms 9728 KB Output is correct
9 Correct 10 ms 9856 KB Output is correct
10 Correct 12 ms 9856 KB Output is correct
11 Correct 10 ms 9856 KB Output is correct
12 Correct 10 ms 9856 KB Output is correct
13 Correct 102 ms 18000 KB Output is correct
14 Correct 166 ms 19440 KB Output is correct
15 Correct 146 ms 20160 KB Output is correct
16 Correct 111 ms 18544 KB Output is correct
17 Correct 146 ms 20080 KB Output is correct
18 Correct 147 ms 20168 KB Output is correct
19 Correct 160 ms 19720 KB Output is correct
20 Correct 9 ms 9728 KB Output is correct
21 Correct 11 ms 9856 KB Output is correct
22 Correct 142 ms 20300 KB Output is correct
23 Correct 114 ms 18032 KB Output is correct
24 Correct 142 ms 20012 KB Output is correct
25 Correct 118 ms 18416 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 10 ms 9728 KB Output isn't correct
2 Incorrect 9 ms 9856 KB Output isn't correct
3 Correct 118 ms 18864 KB Output is correct
4 Correct 102 ms 19048 KB Output is correct
5 Correct 97 ms 19416 KB Output is correct
6 Correct 403 ms 27216 KB Output is correct
7 Incorrect 9 ms 9728 KB Output isn't correct
8 Incorrect 9 ms 9728 KB Output isn't correct
9 Correct 10 ms 9728 KB Output is correct
10 Correct 10 ms 9728 KB Output is correct
11 Correct 10 ms 9728 KB Output is correct
12 Correct 9 ms 9728 KB Output is correct
13 Correct 10 ms 9856 KB Output is correct
14 Incorrect 11 ms 9728 KB Output isn't correct
15 Incorrect 9 ms 9856 KB Output isn't correct
16 Incorrect 11 ms 9856 KB Output isn't correct
17 Correct 10 ms 9856 KB Output is correct
18 Correct 9 ms 9856 KB Output is correct
19 Correct 10 ms 9856 KB Output is correct
20 Correct 10 ms 9856 KB Output is correct
21 Correct 10 ms 9856 KB Output is correct
22 Incorrect 10 ms 9856 KB Output isn't correct
23 Incorrect 146 ms 20540 KB Output isn't correct
24 Incorrect 153 ms 22420 KB Output isn't correct
25 Correct 110 ms 18920 KB Output is correct
26 Correct 108 ms 19064 KB Output is correct
27 Correct 99 ms 18968 KB Output is correct
28 Correct 135 ms 19512 KB Output is correct
29 Correct 295 ms 25108 KB Output is correct
30 Incorrect 165 ms 21736 KB Output isn't correct
31 Incorrect 157 ms 24440 KB Output isn't correct
32 Incorrect 119 ms 20592 KB Output isn't correct
33 Correct 116 ms 19360 KB Output is correct
34 Correct 133 ms 19088 KB Output is correct
35 Correct 101 ms 19064 KB Output is correct
36 Correct 106 ms 19444 KB Output is correct
37 Correct 495 ms 27244 KB Output is correct
38 Incorrect 179 ms 22068 KB Output isn't correct
39 Incorrect 159 ms 20168 KB Output isn't correct
40 Incorrect 176 ms 22320 KB Output isn't correct
41 Correct 114 ms 18888 KB Output is correct
42 Correct 124 ms 18808 KB Output is correct
43 Correct 99 ms 18808 KB Output is correct
44 Correct 171 ms 19500 KB Output is correct
45 Correct 352 ms 23620 KB Output is correct
46 Incorrect 179 ms 21748 KB Output isn't correct
47 Incorrect 145 ms 22332 KB Output isn't correct
48 Incorrect 159 ms 24204 KB Output isn't correct
49 Correct 114 ms 19132 KB Output is correct
50 Correct 107 ms 19192 KB Output is correct
51 Correct 125 ms 19296 KB Output is correct
52 Correct 111 ms 18868 KB Output is correct
53 Correct 335 ms 24212 KB Output is correct
54 Incorrect 139 ms 21304 KB Output isn't correct