oj.uz

Submission #251606

# Submission time Handle Problem Language Result Execution time Memory
251606 2020-07-22T03:16:39 Z abacaba Pipes (BOI13_pipes) C++14
74.0741 / 100
 242 ms 72436 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;
    // assert(cnt <= 1);
    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:150:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < now.size(); ++i) {
                    ~~^~~~~~~~~~~~
pipes.cpp:155:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i + 1 < now.size(); ++i) {
                    ~~~~~~^~~~~~~~~~~~
pipes.cpp:158:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 0; j < g[v].size(); ++j)
                        ~~^~~~~~~~~~~~~
pipes.cpp:167:22: 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:174:6: 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 12 ms 20480 KB Output is correct
3 Correct 12 ms 20608 KB Output is correct
4 Correct 202 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 12 ms 20480 KB Output is correct
9 Correct 12 ms 20608 KB Output is correct
10 Correct 16 ms 20608 KB Output is correct
11 Correct 13 ms 20608 KB Output is correct
12 Correct 12 ms 20608 KB Output is correct
13 Correct 185 ms 32504 KB Output is correct
14 Correct 213 ms 34808 KB Output is correct
15 Correct 192 ms 35576 KB Output is correct
16 Correct 165 ms 33396 KB Output is correct
17 Correct 187 ms 35576 KB Output is correct
18 Correct 199 ms 35704 KB Output is correct
19 Correct 189 ms 38136 KB Output is correct
20 Correct 11 ms 20480 KB Output is correct
21 Correct 12 ms 20608 KB Output is correct
22 Correct 196 ms 35576 KB Output is correct
23 Correct 147 ms 32376 KB Output is correct
24 Correct 196 ms 35576 KB Output is correct
25 Correct 155 ms 33016 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 20480 KB Output is correct
2 Correct 15 ms 20736 KB Output is correct
3 Correct 68 ms 29048 KB Output is correct
4 Runtime error 214 ms 70872 KB Execution killed with signal 11 (could be triggered by violating memory limits)
5 Runtime error 206 ms 59556 KB Execution killed with signal 11 (could be triggered by violating memory limits)
6 Correct 228 ms 42744 KB Output is correct
7 Correct 12 ms 20480 KB Output is correct
8 Correct 13 ms 20400 KB Output is correct
9 Correct 11 ms 19968 KB Output is correct
10 Runtime error 33 ms 41208 KB Execution killed with signal 11 (could be triggered by violating memory limits)
11 Runtime error 35 ms 41208 KB Execution killed with signal 11 (could be triggered by violating memory limits)
12 Runtime error 34 ms 41208 KB Execution killed with signal 11 (could be triggered by violating memory limits)
13 Correct 11 ms 19968 KB Output is correct
14 Correct 11 ms 20480 KB Output is correct
15 Correct 12 ms 20608 KB Output is correct
16 Correct 15 ms 20736 KB Output is correct
17 Correct 11 ms 20096 KB Output is correct
18 Runtime error 42 ms 41592 KB Execution killed with signal 11 (could be triggered by violating memory limits)
19 Runtime error 47 ms 41592 KB Execution killed with signal 11 (could be triggered by violating memory limits)
20 Runtime error 42 ms 41592 KB Execution killed with signal 11 (could be triggered by violating memory limits)
21 Correct 11 ms 20124 KB Output is correct
22 Correct 17 ms 20608 KB Output is correct
23 Correct 170 ms 35320 KB Output is correct
24 Correct 204 ms 38136 KB Output is correct
25 Correct 65 ms 29048 KB Output is correct
26 Runtime error 203 ms 69496 KB Execution killed with signal 11 (could be triggered by violating memory limits)
27 Runtime error 186 ms 70956 KB Execution killed with signal 11 (could be triggered by violating memory limits)
28 Runtime error 218 ms 60884 KB Execution killed with signal 11 (could be triggered by violating memory limits)
29 Correct 188 ms 38392 KB Output is correct
30 Correct 182 ms 39672 KB Output is correct
31 Correct 203 ms 40008 KB Output is correct
32 Correct 228 ms 36088 KB Output is correct
33 Correct 90 ms 30072 KB Output is correct
34 Runtime error 227 ms 68732 KB Execution killed with signal 11 (could be triggered by violating memory limits)
35 Runtime error 210 ms 70904 KB Execution killed with signal 11 (could be triggered by violating memory limits)
36 Runtime error 216 ms 60280 KB Execution killed with signal 11 (could be triggered by violating memory limits)
37 Correct 228 ms 42744 KB Output is correct
38 Correct 193 ms 39288 KB Output is correct
39 Correct 240 ms 35704 KB Output is correct
40 Correct 191 ms 37884 KB Output is correct
41 Correct 74 ms 31864 KB Output is correct
42 Runtime error 196 ms 70028 KB Execution killed with signal 11 (could be triggered by violating memory limits)
43 Runtime error 215 ms 72436 KB Execution killed with signal 11 (could be triggered by violating memory limits)
44 Runtime error 219 ms 59428 KB Execution killed with signal 11 (could be triggered by violating memory limits)
45 Correct 198 ms 39744 KB Output is correct
46 Correct 197 ms 40564 KB Output is correct
47 Correct 188 ms 37880 KB Output is correct
48 Correct 206 ms 39928 KB Output is correct
49 Correct 70 ms 27384 KB Output is correct
50 Runtime error 224 ms 67964 KB Execution killed with signal 11 (could be triggered by violating memory limits)
51 Runtime error 238 ms 64504 KB Execution killed with signal 11 (could be triggered by violating memory limits)
52 Runtime error 195 ms 64376 KB Execution killed with signal 11 (could be triggered by violating memory limits)
53 Correct 198 ms 39672 KB Output is correct
54 Correct 242 ms 38648 KB Output is correct