oj.uz

Submission #251607

# Submission time Handle Problem Language Result Execution time Memory
251607 2020-07-22T03:18:56 Z abacaba Pipes (BOI13_pipes) C++14
74.0741 / 100
 300 ms 74100 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 pp[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;
    pp[v] = p;
    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);
            }
            int u = v;
            while(u != to) {
                unio(u, pp[u]);
                u = pp[u];
            }
        }
        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});
        }
    }
    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:159:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < now.size(); ++i) {
                    ~~^~~~~~~~~~~~
pipes.cpp:164:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i + 1 < now.size(); ++i) {
                    ~~~~~~^~~~~~~~~~~~
pipes.cpp:167:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 0; j < g[v].size(); ++j)
                        ~~^~~~~~~~~~~~~
pipes.cpp:176:22: 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:183:6: 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 20608 KB Output is correct
3 Correct 14 ms 20608 KB Output is correct
4 Correct 192 ms 36472 KB Output is correct
5 Correct 11 ms 20480 KB Output is correct
6 Correct 11 ms 20480 KB Output is correct
7 Correct 13 ms 20480 KB Output is correct
8 Correct 14 ms 20480 KB Output is correct
9 Correct 12 ms 20584 KB Output is correct
10 Correct 14 ms 20608 KB Output is correct
11 Correct 12 ms 20608 KB Output is correct
12 Correct 12 ms 20608 KB Output is correct
13 Correct 161 ms 33112 KB Output is correct
14 Correct 192 ms 35448 KB Output is correct
15 Correct 192 ms 36344 KB Output is correct
16 Correct 169 ms 34040 KB Output is correct
17 Correct 213 ms 36472 KB Output is correct
18 Correct 193 ms 36344 KB Output is correct
19 Correct 189 ms 38904 KB Output is correct
20 Correct 11 ms 20480 KB Output is correct
21 Correct 12 ms 20608 KB Output is correct
22 Correct 195 ms 36416 KB Output is correct
23 Correct 142 ms 33016 KB Output is correct
24 Correct 260 ms 36344 KB Output is correct
25 Correct 158 ms 33652 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 20480 KB Output is correct
2 Correct 13 ms 20736 KB Output is correct
3 Correct 81 ms 29816 KB Output is correct
4 Runtime error 229 ms 72440 KB Execution killed with signal 11 (could be triggered by violating memory limits)
5 Runtime error 219 ms 59576 KB Execution killed with signal 11 (could be triggered by violating memory limits)
6 Correct 246 ms 43128 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 35 ms 41208 KB Execution killed with signal 11 (could be triggered by violating memory limits)
11 Runtime error 35 ms 41216 KB Execution killed with signal 11 (could be triggered by violating memory limits)
12 Runtime error 34 ms 41212 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 20736 KB Output is correct
16 Correct 12 ms 20608 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 35 ms 41592 KB Execution killed with signal 11 (could be triggered by violating memory limits)
20 Runtime error 35 ms 41600 KB Execution killed with signal 11 (could be triggered by violating memory limits)
21 Correct 11 ms 20096 KB Output is correct
22 Correct 12 ms 20608 KB Output is correct
23 Correct 134 ms 35960 KB Output is correct
24 Correct 179 ms 39032 KB Output is correct
25 Correct 69 ms 29816 KB Output is correct
26 Runtime error 203 ms 70432 KB Execution killed with signal 11 (could be triggered by violating memory limits)
27 Runtime error 205 ms 72620 KB Execution killed with signal 11 (could be triggered by violating memory limits)
28 Runtime error 214 ms 72696 KB Execution killed with signal 11 (could be triggered by violating memory limits)
29 Correct 185 ms 38520 KB Output is correct
30 Correct 195 ms 40568 KB Output is correct
31 Correct 165 ms 40824 KB Output is correct
32 Correct 196 ms 36856 KB Output is correct
33 Correct 71 ms 30840 KB Output is correct
34 Runtime error 179 ms 67456 KB Execution killed with signal 11 (could be triggered by violating memory limits)
35 Runtime error 240 ms 72740 KB Execution killed with signal 11 (could be triggered by violating memory limits)
36 Runtime error 199 ms 72312 KB Execution killed with signal 11 (could be triggered by violating memory limits)
37 Correct 236 ms 43184 KB Output is correct
38 Correct 192 ms 40056 KB Output is correct
39 Correct 197 ms 36344 KB Output is correct
40 Correct 210 ms 38648 KB Output is correct
41 Correct 107 ms 32632 KB Output is correct
42 Runtime error 185 ms 70776 KB Execution killed with signal 11 (could be triggered by violating memory limits)
43 Runtime error 201 ms 74100 KB Execution killed with signal 11 (could be triggered by violating memory limits)
44 Runtime error 205 ms 59692 KB Execution killed with signal 11 (could be triggered by violating memory limits)
45 Correct 188 ms 39752 KB Output is correct
46 Correct 216 ms 41464 KB Output is correct
47 Correct 185 ms 38648 KB Output is correct
48 Correct 213 ms 40704 KB Output is correct
49 Correct 75 ms 28152 KB Output is correct
50 Runtime error 300 ms 68860 KB Execution killed with signal 11 (could be triggered by violating memory limits)
51 Runtime error 207 ms 65916 KB Execution killed with signal 11 (could be triggered by violating memory limits)
52 Runtime error 167 ms 62828 KB Execution killed with signal 11 (could be triggered by violating memory limits)
53 Correct 218 ms 39800 KB Output is correct
54 Correct 208 ms 39556 KB Output is correct