oj.uz

Submission #251603

# Submission time Handle Problem Language Result Execution time Memory
251603 2020-07-22T03:10:14 Z abacaba Pipes (BOI13_pipes) C++14
74.0741 / 100
 251 ms 72432 KB 
#include <iostream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <cstring>
#include <chrono>
#include <vector>
#include <map>
#include <random>
#include <set>
#include <algorithm>
#include <math.h>
#include <cstdio>
#include <stdio.h>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <deque>
#include <cassert>
#include <stack>
using namespace std;
 
#define mp make_pair
#define f first
#define se second
#define pb push_back
#define ppb pop_back
#define emb emplace_back
#define ll long long
#define ull unsigned long long
#define cntbit(x) __builtin_popcount(x)
#define endl '\n'
#define uset unordered_set
#define umap unordered_map
#define pii pair<int, int>
#define ld long double
#define pll pair<long long, long long>
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
template <typename T> inline T range(T l, T r) {
    return uniform_int_distribution<T>(l, r)(rng);
}
 
inline void setin(string s) {
    freopen(s.c_str(), "r", stdin);
}
 
inline void setout(string s) {
    freopen(s.c_str(), "w", stdout);
}
 
template <typename T> void Min(T &a, T b) {
    a = min(a, b);
}
 
template <typename T> void Max(T &a, T b) {
    a = max(a, b);
}
 
#define int long long
 
const int mod = 1e9 + 7;
const int inf = 2e9;
const int N = 5e5 + 15;
int n, m, a[N];
vector <int> g[N];
bool used[N];
 
set <pii> cur;
int deg[N], d[N];
 
int p[N], sz[N];
pii e[N];
int ans[N];
 
set <int> cycles;
vector <int> inc;
 
int pref[2][N];
 
int find(int v) {
    if(v == p[v])
        return v;
    return p[v] = find(p[v]);
}
 
void unio(int a, int b) {
    a = find(a);
    b = find(b);
    if(a != b) {
        if(sz[a] < sz[b])
            swap(a, b);
        p[b] = a;
        sz[a] += sz[b];
    }
}
 
inline int gt(int i, int v) {
    return e[i].f == v ? e[i].se : e[i].f;
}
 
void precheck(int v, int p = -1) {
    used[v] = true;
    for(int ind : g[v]) {
        int to = gt(ind, v);
        if(to == p)
            continue;
        if(used[to]) {
            if(d[to] > d[v])
                continue;
            if((d[v] - d[to]) & 1) {
                cout << 0 << endl;
                exit(0);
            }
        }
        else {
            d[to] = d[v] + 1;
            precheck(to, v);
        }
    }
}
 
vector <int> now;
 
void dfs(int v) {
    used[v] = true;
    now.pb(v);
    for(int ind : g[v]) {
        int to = gt(ind, v);
        if(used[to] || find(v) != find(to))
            continue;
        dfs(to);
    }
}
 
inline int get(int k, int l, int r) {
    k = (k + 10) & 1;
    Max(l, 0LL);
    if(l > r)
        return 0;
    return pref[k][r] - (l == 0 ? 0 : pref[k][l-1]);
}
 
void solve_for_cycle() {
    int sum = 0;
    for(int v : now)
        sum += a[v];
    for(int i = 0; i < now.size(); ++i) {
        for(int j = 0; j < 2; ++j)
            pref[j][i] = (i == 0 ? 0 : pref[j][i-1]);
        pref[i & 1][i] += a[now[i]];
    }
    for(int i = 0; i + 1 < now.size(); ++i) {
        int v = now[i];
        int ind = -1;
        for(int j = 0; j < g[v].size(); ++j)
            if(gt(g[v][j], v) == now[i + 1])
                ind = g[v][j];
        assert(ind != -1);
        int val = get(i + 2, i + 2, now.size() - 1) + get(i - 1, 0, i - 1);
        ans[ind] = sum - 2 * val;
    }
    int v = now.back();
    int ind = -1;
    for(int j = 0; j < g[v].size(); ++j)
        if(gt(g[v][j], v) == now[0])
            ind = g[v][j];
    int val = get(1, 1, now.size() - 2);
    ans[ind] = sum - 2 * val;
}
 
main() {
    for(int i = 0; i < N; ++i)
        p[i] = i, sz[i] = 1;
    ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0);
    // setin("input.txt");
    cin >> n >> m;
    for(int i = 1; i <= n; ++i)
        cin >> a[i];
    for(int i = 1; i <= m; ++i) {
        cin >> e[i].f >> e[i].se;
        g[e[i].f].pb(i);
        g[e[i].se].pb(i);
    }
    precheck(1);
    for(int i = 1; i <= n; ++i)
        deg[i] = g[i].size(), cur.insert({g[i].size(), i});
    memset(used, 0, sizeof(used));
    while(!cur.empty()) {
        int v = cur.begin()->se;
        cur.erase(cur.begin());
        used[v] = true;
        for(int ind : g[v]) {
            int to = gt(ind, v);
            if(used[to] && deg[to] == 1)
                a[v] -= ans[ind] / 2;
        }
        if(deg[v] != 1)
            continue;
        for(int ind : g[v]) {
            int to = gt(ind, v);
            if(used[to])
                continue;
            ans[ind] = 2 * a[v];
            cur.erase({deg[to], to});
            --deg[to];
            cur.insert({deg[to], to});
        }
    }
    for(int v = 1; v <= n; ++v) {
        for(int ind : g[v]) {
            int to = gt(ind, v);
            if(deg[v] > 1 && deg[to] > 1)
                unio(v, to);
        }
    }
    int cnt = 0;
    memset(used, 0, sizeof(used));
    for(int i = 1; i <= n; ++i) {
        if(sz[find(i)] > 1 && !used[i]) {
            dfs(i);
            solve_for_cycle();
            ++cnt;
        }
    }
    if(cnt > 1)
        return cout << 0 << endl, 0;
    for(int i = 1; i <= m; ++i)
        cout << ans[i] << endl;
    return 0;
}

Compilation message

pipes.cpp: In function 'void solve_for_cycle()':
pipes.cpp:149:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < now.size(); ++i) {
                    ~~^~~~~~~~~~~~
pipes.cpp:154:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i + 1 < now.size(); ++i) {
                    ~~~~~~^~~~~~~~~~~~
pipes.cpp:157:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 0; j < g[v].size(); ++j)
                        ~~^~~~~~~~~~~~~
pipes.cpp:166:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j = 0; j < g[v].size(); ++j)
                    ~~^~~~~~~~~~~~~
pipes.cpp: At global scope:
pipes.cpp:173:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 20480 KB Output is correct
2 Correct 11 ms 20480 KB Output is correct
3 Correct 12 ms 20608 KB Output is correct
4 Correct 196 ms 35576 KB Output is correct
5 Correct 11 ms 20480 KB Output is correct
6 Correct 11 ms 20480 KB Output is correct
7 Correct 11 ms 20480 KB Output is correct
8 Correct 11 ms 20480 KB Output is correct
9 Correct 12 ms 20608 KB Output is correct
10 Correct 12 ms 20608 KB Output is correct
11 Correct 12 ms 20608 KB Output is correct
12 Correct 14 ms 20608 KB Output is correct
13 Correct 152 ms 32504 KB Output is correct
14 Correct 179 ms 34680 KB Output is correct
15 Correct 198 ms 35652 KB Output is correct
16 Correct 159 ms 33340 KB Output is correct
17 Correct 189 ms 35576 KB Output is correct
18 Correct 195 ms 35576 KB Output is correct
19 Correct 183 ms 38136 KB Output is correct
20 Correct 11 ms 20480 KB Output is correct
21 Correct 11 ms 20608 KB Output is correct
22 Correct 198 ms 35576 KB Output is correct
23 Correct 150 ms 32636 KB Output is correct
24 Correct 210 ms 35576 KB Output is correct
25 Correct 167 ms 32988 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 20480 KB Output is correct
2 Correct 12 ms 20608 KB Output is correct
3 Correct 77 ms 29040 KB Output is correct
4 Runtime error 251 ms 70904 KB Execution killed with signal 11 (could be triggered by violating memory limits)
5 Runtime error 228 ms 59428 KB Execution killed with signal 11 (could be triggered by violating memory limits)
6 Correct 231 ms 42940 KB Output is correct
7 Correct 11 ms 20480 KB Output is correct
8 Correct 11 ms 20480 KB Output is correct
9 Correct 11 ms 19968 KB Output is correct
10 Runtime error 34 ms 41208 KB Execution killed with signal 11 (could be triggered by violating memory limits)
11 Runtime error 34 ms 41240 KB Execution killed with signal 11 (could be triggered by violating memory limits)
12 Runtime error 35 ms 41336 KB Execution killed with signal 11 (could be triggered by violating memory limits)
13 Correct 11 ms 19968 KB Output is correct
14 Correct 14 ms 20480 KB Output is correct
15 Correct 12 ms 20608 KB Output is correct
16 Correct 12 ms 20608 KB Output is correct
17 Correct 12 ms 20096 KB Output is correct
18 Runtime error 34 ms 41596 KB Execution killed with signal 11 (could be triggered by violating memory limits)
19 Runtime error 36 ms 41592 KB Execution killed with signal 11 (could be triggered by violating memory limits)
20 Runtime error 37 ms 41640 KB Execution killed with signal 11 (could be triggered by violating memory limits)
21 Correct 11 ms 20096 KB Output is correct
22 Correct 13 ms 20608 KB Output is correct
23 Correct 140 ms 35368 KB Output is correct
24 Correct 190 ms 38136 KB Output is correct
25 Correct 67 ms 29088 KB Output is correct
26 Runtime error 205 ms 69436 KB Execution killed with signal 11 (could be triggered by violating memory limits)
27 Runtime error 194 ms 71080 KB Execution killed with signal 11 (could be triggered by violating memory limits)
28 Runtime error 228 ms 60792 KB Execution killed with signal 11 (could be triggered by violating memory limits)
29 Correct 182 ms 38392 KB Output is correct
30 Correct 208 ms 39800 KB Output is correct
31 Correct 173 ms 40056 KB Output is correct
32 Correct 205 ms 36088 KB Output is correct
33 Correct 70 ms 30072 KB Output is correct
34 Runtime error 200 ms 68816 KB Execution killed with signal 11 (could be triggered by violating memory limits)
35 Runtime error 232 ms 71120 KB Execution killed with signal 11 (could be triggered by violating memory limits)
36 Runtime error 214 ms 60104 KB Execution killed with signal 11 (could be triggered by violating memory limits)
37 Correct 250 ms 42744 KB Output is correct
38 Correct 211 ms 39288 KB Output is correct
39 Correct 225 ms 35576 KB Output is correct
40 Correct 210 ms 37880 KB Output is correct
41 Correct 80 ms 31864 KB Output is correct
42 Runtime error 198 ms 70004 KB Execution killed with signal 11 (could be triggered by violating memory limits)
43 Runtime error 202 ms 72432 KB Execution killed with signal 11 (could be triggered by violating memory limits)
44 Runtime error 224 ms 59304 KB Execution killed with signal 11 (could be triggered by violating memory limits)
45 Correct 170 ms 39672 KB Output is correct
46 Correct 198 ms 40568 KB Output is correct
47 Correct 203 ms 37940 KB Output is correct
48 Correct 184 ms 39928 KB Output is correct
49 Correct 63 ms 27384 KB Output is correct
50 Runtime error 227 ms 68224 KB Execution killed with signal 11 (could be triggered by violating memory limits)
51 Runtime error 235 ms 64380 KB Execution killed with signal 11 (could be triggered by violating memory limits)
52 Runtime error 194 ms 64332 KB Execution killed with signal 11 (could be triggered by violating memory limits)
53 Correct 188 ms 39672 KB Output is correct
54 Correct 198 ms 38648 KB Output is correct