oj.uz

Submission #1111251

# Submission time Handle Problem Language Result Execution time Memory
1111251 2024-11-11T20:46:39 Z codexistent Pipes (BOI13_pipes) C++14
74.0741 / 100
 299 ms 48200 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MAXN 100005
#define MAXM 500005
#define FOR(i, a, b) for(ll i = a; i <= b; i++)
#define f first
#define s second

ll n, m, t[MAXN], en[MAXN], r[MAXM];
pair<ll, ll> e[MAXM];
vector<pair<ll, ll>> adj[MAXN];
bool v[MAXN];

int main(){
    cin >> n >> m;
    FOR(i, 1, n) {
        cin >> t[i];
        en[i] = 0, v[i] = false;
    }
    FOR(i, 1, m){
        cin >> e[i].f >> e[i].s;
        adj[e[i].f].push_back({e[i].s, i}), en[e[i].f]++;
        adj[e[i].s].push_back({e[i].f, i}), en[e[i].s]++;
        r[i] = 1000000001;
    }
    if(!(m == n - 1 || m == n)) return cout << 0 << endl, 0;

    queue<ll> q;
    FOR(i, 1, n) if(en[i] == 1) q.push(i);

    ll d = n;
    while(q.size()){
        ll qi = q.front(); q.pop();
        if(v[qi]) continue;
        v[qi] = true, d--;
        if(en[qi] == 0) continue;

        for(pair<ll, ll> p : adj[qi]) if(r[p.s] == 1000000001) {
            r[p.s] = 2 * t[qi];
            t[p.f] -= t[qi], en[p.f]--;

            if(!v[p.f] && en[p.f] == 1) q.push(p.f);
        }
    }

    if(d != 0 && d % 2 == 0) return cout << 0 << endl, 0;

    ll stt, ci = -1;
    FOR(i, 1, n) if(!v[i]) ci = i;
    if(ci == -1) {
        FOR(i, 1, m) cout << r[i] << endl;
        return 0;
    }
    stt = ci;

    stack<ll> st;
    ll alts = 0;
    do{
        for(pair<ll, ll> p : adj[ci]) if(r[p.s] != 1000000001) {
            alts = p.s + (-1)*(alts);
            ci = p.f;
            break;
       }
        st.push(ci);
    }while(stt != ci);

    ll prvi;
    for(pair<ll, ll> p : adj[stt]) if(r[p.s] != 1000000001) {
        prvi = r[p.s] = t[stt] - alts;
        if(prvi % 2) return cout << 0 << endl, 0;
    }

    st.pop();
    while(!st.empty()){
        ll sti = st.top(); st.pop();

        for(pair<ll, ll> p : adj[sti]) if(e[p.s].f == prvi || e[p.s].s == prvi) {
            prvi = r[p.s] = 2 * (r[sti] - prvi / 2);
            if(prvi % 2) return cout << 0 << endl, 0;
        }
    }

    FOR(i, 1, m) cout << r[i] << endl;
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:78:60: warning: 'prvi' may be used uninitialized in this function [-Wmaybe-uninitialized]
   78 |         for(pair<ll, ll> p : adj[sti]) if(e[p.s].f == prvi || e[p.s].s == prvi) {
      |                                           ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2640 KB Output is correct
2 Correct 2 ms 2640 KB Output is correct
3 Correct 4 ms 2896 KB Output is correct
4 Correct 238 ms 14164 KB Output is correct
5 Correct 2 ms 2640 KB Output is correct
6 Correct 2 ms 2640 KB Output is correct
7 Correct 3 ms 2640 KB Output is correct
8 Correct 2 ms 2640 KB Output is correct
9 Correct 4 ms 2896 KB Output is correct
10 Correct 4 ms 2896 KB Output is correct
11 Correct 4 ms 2896 KB Output is correct
12 Correct 4 ms 2896 KB Output is correct
13 Correct 164 ms 11848 KB Output is correct
14 Correct 203 ms 13656 KB Output is correct
15 Correct 207 ms 14152 KB Output is correct
16 Correct 175 ms 12616 KB Output is correct
17 Correct 230 ms 14152 KB Output is correct
18 Correct 211 ms 14164 KB Output is correct
19 Correct 221 ms 14072 KB Output is correct
20 Correct 2 ms 2640 KB Output is correct
21 Correct 4 ms 2896 KB Output is correct
22 Correct 236 ms 14284 KB Output is correct
23 Correct 173 ms 11848 KB Output is correct
24 Correct 232 ms 14448 KB Output is correct
25 Correct 179 ms 12248 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2640 KB Output isn't correct
2 Incorrect 4 ms 2896 KB Output isn't correct
3 Correct 66 ms 13128 KB Output is correct
4 Correct 77 ms 13392 KB Output is correct
5 Correct 65 ms 13144 KB Output is correct
6 Correct 266 ms 48200 KB Output is correct
7 Incorrect 3 ms 2804 KB Output isn't correct
8 Incorrect 2 ms 2604 KB Output isn't correct
9 Correct 2 ms 2640 KB Output is correct
10 Correct 2 ms 2808 KB Output is correct
11 Correct 2 ms 2640 KB Output is correct
12 Correct 3 ms 2804 KB Output is correct
13 Correct 2 ms 2640 KB Output is correct
14 Incorrect 3 ms 2640 KB Output isn't correct
15 Incorrect 4 ms 2896 KB Output isn't correct
16 Incorrect 4 ms 2896 KB Output isn't correct
17 Correct 3 ms 2896 KB Output is correct
18 Correct 3 ms 2808 KB Output is correct
19 Correct 3 ms 3112 KB Output is correct
20 Correct 3 ms 2816 KB Output is correct
21 Correct 3 ms 2896 KB Output is correct
22 Incorrect 4 ms 2896 KB Output isn't correct
23 Incorrect 182 ms 12360 KB Output isn't correct
24 Incorrect 233 ms 14644 KB Output isn't correct
25 Correct 77 ms 13128 KB Output is correct
26 Correct 68 ms 13384 KB Output is correct
27 Correct 64 ms 13388 KB Output is correct
28 Correct 74 ms 13896 KB Output is correct
29 Correct 237 ms 39496 KB Output is correct
30 Incorrect 210 ms 14124 KB Output isn't correct
31 Incorrect 218 ms 14408 KB Output isn't correct
32 Incorrect 214 ms 14152 KB Output isn't correct
33 Correct 68 ms 13592 KB Output is correct
34 Correct 68 ms 13528 KB Output is correct
35 Correct 66 ms 13384 KB Output is correct
36 Correct 65 ms 13648 KB Output is correct
37 Correct 299 ms 48200 KB Output is correct
38 Incorrect 216 ms 14412 KB Output isn't correct
39 Incorrect 219 ms 14152 KB Output isn't correct
40 Incorrect 222 ms 14464 KB Output isn't correct
41 Correct 77 ms 13444 KB Output is correct
42 Correct 68 ms 13504 KB Output is correct
43 Correct 65 ms 13304 KB Output is correct
44 Correct 62 ms 13128 KB Output is correct
45 Correct 211 ms 42824 KB Output is correct
46 Incorrect 213 ms 14056 KB Output isn't correct
47 Incorrect 220 ms 14500 KB Output isn't correct
48 Incorrect 204 ms 14552 KB Output isn't correct
49 Correct 81 ms 13132 KB Output is correct
50 Correct 76 ms 13384 KB Output is correct
51 Correct 74 ms 13392 KB Output is correct
52 Correct 69 ms 13384 KB Output is correct
53 Correct 221 ms 42824 KB Output is correct
54 Incorrect 223 ms 14152 KB Output isn't correct