| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 84111 |
2018-11-13T02:51:59 Z |
shoemakerjo |
Pipes (BOI13_pipes) |
C++14 |
|
262 ms |
20412 KB |
#include <bits/stdc++.h>
using namespace std;
#define maxn 100010
#define pii pair<int, int>
#define maxm 500010
#define ll long long
int N, M;
vector<pii> adj[maxn];
vector<pii> adj2[maxn];
ll nums[maxn];
ll ans[maxm];
int deg[maxn];
bool del[maxn];
bool vis[maxn];
void dfstree(int u, int p) {
for (pii vp : adj[u]) {
if (vp.first != p) {
dfstree(vp.first, u);
ans[vp.second] = 2 * nums[vp.first];
nums[u] -= ans[vp.second]/2;
}
}
}
void gotree() {
dfstree(1, -1);
for (int i = 0; i < M; i++) {
cout << ans[i] << '\n';
}
cout.flush();
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> N >> M;
for (int i = 1; i <= N; i++) {
cin >> nums[i];
}
int u, v;
for (int i = 0; i < M; i++) {
cin >> u >> v;
deg[u]++;
deg[v]++;
adj[u].push_back(pii(v, i));
adj[v].push_back(pii(u, i));
}
if (M > N) {
cout << 0 << endl;
return 0;
}
if (M == N-1) {
gotree();
return 0;
}
stack<int> s;
//do some stuff
for (int i = 1; i <= N; i++) {
if (deg[i] == 1) s.push(i);
}
while (s.size()) {
u = s.top(); s.pop();
del[u] = true;
for (pii vp : adj[u]) {
if (!del[vp.first]) {
deg[vp.first]--;
ans[vp.second] = 2*nums[u];
nums[vp.first] -= ans[vp.second]/2;
if (deg[vp.first] == 1) {
del[vp.first] = true;
s.push(vp.first);
}
}
}
}
int cur;
for (int i = 1; i <= N; i++) {
if (!del[i]) {
cur = i;
for (pii vp : adj[i]) {
if (!del[vp.first]) {
adj2[i].push_back(vp);
}
}
}
}
ll sum = 0;
sum += nums[cur];
ll mult = -1;
int og = cur;
int numseen = 1;
// cout << "guy: " << nums[7] << endl;
do {
vis[cur] = true;
// cout << "cur: " << cur << endl;
for (int i = 1; i >= 0; i--) {
pii vp = adj2[cur][i];
if (!vis[vp.first]) {
cur = vp.first;
numseen++;
// cout << "contribution: " << nums[cur] << " mult: " << mult << endl;
sum += mult*nums[cur];
mult *= -1LL;
break;
}
}
} while (!vis[cur]);
// cout << "numseen: " << numseen << endl;
if (numseen%2 == 0) {
cout << 0 << endl;
return 0;
}
fill(vis, vis+maxn, false);
ans[adj2[og][0].second] = sum; //not sure if I have to divide by 2
// cout << og << " to " << adj2[og][0].first << " assigned to " << sum << endl;
cur = adj2[og][0].first;
vis[og] = true;
while (cur != og) {
vis[cur] = true;
for (int i = 0; i <= 1; i++) {
pii vp = adj2[cur][i];
if (!vis[vp.first]) {
// cout << "looking at: " << cur << " to " << vp.first << endl;
ans[vp.second] = 2 * (nums[cur] -
ans[adj2[cur][1-i].second]/2);
cur = vp.first;
// vis[cur] = true;
break;
}
}
if (vis[cur]) break;
}
for (int i = 0; i <= 1; i++) {
pii vp = adj2[cur][i];
if (vp.first == og) {
ans[vp.second] = 2 * (nums[cur] - ans[adj2[cur][1-i].second]/2);
}
}
for (int i = 0; i < M; i++) {
cout << ans[i] << '\n';
}
cout.flush();
}
Compilation message
pipes.cpp: In function 'int main()':
pipes.cpp:103:17: warning: 'cur' may be used uninitialized in this function [-Wmaybe-uninitialized]
sum += nums[cur];
~~~~~~~~^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
4984 KB |
Output is correct |
| 2 |
Correct |
6 ms |
5248 KB |
Output is correct |
| 3 |
Correct |
7 ms |
5248 KB |
Output is correct |
| 4 |
Correct |
118 ms |
11276 KB |
Output is correct |
| 5 |
Correct |
6 ms |
11276 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11276 KB |
Output is correct |
| 7 |
Correct |
8 ms |
11276 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11276 KB |
Output is correct |
| 9 |
Correct |
9 ms |
11276 KB |
Output is correct |
| 10 |
Correct |
8 ms |
11276 KB |
Output is correct |
| 11 |
Correct |
9 ms |
11276 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11276 KB |
Output is correct |
| 13 |
Correct |
78 ms |
11276 KB |
Output is correct |
| 14 |
Correct |
82 ms |
11276 KB |
Output is correct |
| 15 |
Correct |
83 ms |
11428 KB |
Output is correct |
| 16 |
Correct |
88 ms |
11428 KB |
Output is correct |
| 17 |
Correct |
89 ms |
11568 KB |
Output is correct |
| 18 |
Correct |
91 ms |
11568 KB |
Output is correct |
| 19 |
Correct |
104 ms |
14912 KB |
Output is correct |
| 20 |
Correct |
6 ms |
14912 KB |
Output is correct |
| 21 |
Correct |
8 ms |
14912 KB |
Output is correct |
| 22 |
Correct |
92 ms |
14912 KB |
Output is correct |
| 23 |
Correct |
64 ms |
14912 KB |
Output is correct |
| 24 |
Correct |
81 ms |
14912 KB |
Output is correct |
| 25 |
Correct |
65 ms |
14912 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
14912 KB |
Output is correct |
| 2 |
Correct |
7 ms |
14912 KB |
Output is correct |
| 3 |
Correct |
80 ms |
14912 KB |
Output is correct |
| 4 |
Correct |
62 ms |
14912 KB |
Output is correct |
| 5 |
Correct |
62 ms |
14912 KB |
Output is correct |
| 6 |
Correct |
262 ms |
20332 KB |
Output is correct |
| 7 |
Correct |
8 ms |
20332 KB |
Output is correct |
| 8 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 9 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 10 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 11 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 12 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 13 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 14 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 15 |
Correct |
7 ms |
20332 KB |
Output is correct |
| 16 |
Correct |
7 ms |
20332 KB |
Output is correct |
| 17 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 18 |
Correct |
7 ms |
20332 KB |
Output is correct |
| 19 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 20 |
Correct |
6 ms |
20332 KB |
Output is correct |
| 21 |
Correct |
7 ms |
20332 KB |
Output is correct |
| 22 |
Correct |
7 ms |
20332 KB |
Output is correct |
| 23 |
Correct |
77 ms |
20332 KB |
Output is correct |
| 24 |
Correct |
99 ms |
20332 KB |
Output is correct |
| 25 |
Correct |
71 ms |
20332 KB |
Output is correct |
| 26 |
Correct |
68 ms |
20332 KB |
Output is correct |
| 27 |
Correct |
60 ms |
20332 KB |
Output is correct |
| 28 |
Correct |
74 ms |
20332 KB |
Output is correct |
| 29 |
Correct |
221 ms |
20332 KB |
Output is correct |
| 30 |
Correct |
98 ms |
20332 KB |
Output is correct |
| 31 |
Correct |
123 ms |
20332 KB |
Output is correct |
| 32 |
Correct |
87 ms |
20332 KB |
Output is correct |
| 33 |
Correct |
80 ms |
20332 KB |
Output is correct |
| 34 |
Correct |
60 ms |
20332 KB |
Output is correct |
| 35 |
Correct |
63 ms |
20332 KB |
Output is correct |
| 36 |
Correct |
63 ms |
20332 KB |
Output is correct |
| 37 |
Correct |
241 ms |
20412 KB |
Output is correct |
| 38 |
Correct |
127 ms |
20412 KB |
Output is correct |
| 39 |
Correct |
83 ms |
20412 KB |
Output is correct |
| 40 |
Correct |
103 ms |
20412 KB |
Output is correct |
| 41 |
Correct |
94 ms |
20412 KB |
Output is correct |
| 42 |
Correct |
56 ms |
20412 KB |
Output is correct |
| 43 |
Correct |
65 ms |
20412 KB |
Output is correct |
| 44 |
Correct |
58 ms |
20412 KB |
Output is correct |
| 45 |
Correct |
181 ms |
20412 KB |
Output is correct |
| 46 |
Correct |
91 ms |
20412 KB |
Output is correct |
| 47 |
Correct |
92 ms |
20412 KB |
Output is correct |
| 48 |
Correct |
107 ms |
20412 KB |
Output is correct |
| 49 |
Correct |
80 ms |
20412 KB |
Output is correct |
| 50 |
Correct |
61 ms |
20412 KB |
Output is correct |
| 51 |
Correct |
59 ms |
20412 KB |
Output is correct |
| 52 |
Correct |
65 ms |
20412 KB |
Output is correct |
| 53 |
Correct |
201 ms |
20412 KB |
Output is correct |
| 54 |
Correct |
90 ms |
20412 KB |
Output is correct |
