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Submission #136985

# Submission time Handle Problem Language Result Execution time Memory
136985 2019-07-26T20:02:52 Z Gustav Tug of War (BOI15_tug) C++14
71 / 100
 3000 ms 7872 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int, int> pi;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<vi> vvi;
const int inf = 0x3f3f3f3f;
const ll linf = 123456789012345678;
const ll mod1 = 1000000007;
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " = " << x << endl
#define sz(x) ((int)(x).size())

int n, k;
vector<vpi> adj;
vi visited;
vi starts;
int constup = 0, constdown = 0;

bool findcycle(int node, int parent, bool found){
    if(visited[node]){
        if(!found) starts.push_back(node);
        return true;
    }
    visited[node] = 1;
    for(auto x : adj[node]){
        if(x.first != parent)
            found |= findcycle(x.first, node, found);
    }
    return found;
}

pair<bool, pi> dfs(int node, int parent){
    visited[node] = 1;
    int sumup = 0;
    int sumdown = 0;
    bool toparent = false;
    bool cycle = false;
    for(auto x : adj[node]){
        if(visited[x.first]){
            if(parent == -1){
                if(node >= n) sumup += x.second;
                else sumdown += x.second;
            }
            if(parent != x.first) cycle = true;
            else if(toparent) cycle = true;
            else toparent = true;
            continue;
        }
        pair<bool, pi> r = dfs(x.first, node);
        if(!r.first){
            if(node < n) constup += x.second;
            else constdown += x.second;
            continue;
        }
        cycle = true;
        sumup += r.second.first;
        sumdown += r.second.second;
        if(node < n) sumup += x.second;
        else sumdown += x.second;
    }
    return {cycle, {sumup, sumdown}};
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> n >> k;
    adj = vector<vpi>(2*n);
    int strengthsum = 0;
    for(int i = 0; i < 2*n; i++){
        int l, r, s;
        cin >> l >> r >> s;
        l--,r--;
        r+=n;
        adj[l].emplace_back(r, s);
        adj[r].emplace_back(l, s);
        strengthsum += s;
    }
    visited = vi(2*n);
    for(int i = 0; i < 2*n; i++){
        if(!visited[i] && !findcycle(i, -1, false)){
            cout << "NO\n";
            return 0;
        }
    }
    visited = vi(2*n);
    int diff = 0;
    vi alts;
    for(int x : starts){
        pair<bool, pi> r = dfs(x, -1);
        alts.push_back(2*(r.second.second - r.second.first));
        diff += r.second.first - r.second.second;
    }
    diff += constup-constdown;
    int from = -k-diff;
    int to = k-diff;
    gp_hash_table<int, int> p;
    p[0] = 1;
    for(int i = 0; i < sz(alts); i++){
        vi a;
        for(auto x : p){
            a.push_back(x.first);
        }
        for(int x : a){
            p[x+alts[i]] = 1;
        }
    }
    bool ans = false;
    for(auto x : p){
        if(x.first >= from && x.first <= to) ans = true;
    }
    if(ans) cout << "YES\n";
    else cout << "NO\n";
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 380 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 380 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 376 KB Output is correct
22 Correct 2 ms 376 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 2 ms 376 KB Output is correct
25 Correct 2 ms 376 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 380 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 380 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 376 KB Output is correct
22 Correct 2 ms 376 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 2 ms 376 KB Output is correct
25 Correct 2 ms 376 KB Output is correct
26 Correct 172 ms 1476 KB Output is correct
27 Correct 79 ms 3244 KB Output is correct
28 Correct 170 ms 1348 KB Output is correct
29 Correct 80 ms 3324 KB Output is correct
30 Correct 173 ms 1348 KB Output is correct
31 Correct 76 ms 3192 KB Output is correct
32 Correct 172 ms 1348 KB Output is correct
33 Correct 77 ms 3200 KB Output is correct
34 Correct 21 ms 1976 KB Output is correct
35 Correct 78 ms 3156 KB Output is correct
36 Correct 174 ms 1348 KB Output is correct
37 Correct 77 ms 3196 KB Output is correct
38 Correct 176 ms 1396 KB Output is correct
39 Correct 77 ms 3196 KB Output is correct
40 Correct 189 ms 1348 KB Output is correct
41 Correct 78 ms 3196 KB Output is correct
42 Correct 176 ms 1320 KB Output is correct
43 Correct 81 ms 3324 KB Output is correct
44 Correct 175 ms 1348 KB Output is correct
45 Correct 77 ms 3196 KB Output is correct
46 Correct 170 ms 1348 KB Output is correct
47 Correct 4 ms 632 KB Output is correct
48 Correct 47 ms 1016 KB Output is correct
49 Correct 48 ms 1144 KB Output is correct
50 Correct 489 ms 3284 KB Output is correct
51 Correct 486 ms 3572 KB Output is correct

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 1912 KB Output is correct
2 Correct 15 ms 2012 KB Output is correct
3 Correct 13 ms 1912 KB Output is correct
4 Correct 12 ms 1912 KB Output is correct
5 Correct 13 ms 1912 KB Output is correct
6 Correct 12 ms 1912 KB Output is correct
7 Correct 13 ms 1912 KB Output is correct
8 Correct 12 ms 1912 KB Output is correct
9 Correct 15 ms 1912 KB Output is correct
10 Correct 12 ms 1912 KB Output is correct
11 Correct 13 ms 1912 KB Output is correct
12 Correct 12 ms 1912 KB Output is correct
13 Correct 13 ms 2040 KB Output is correct
14 Correct 14 ms 1912 KB Output is correct
15 Correct 12 ms 1912 KB Output is correct
16 Correct 13 ms 1912 KB Output is correct
17 Correct 12 ms 1912 KB Output is correct
18 Correct 13 ms 1912 KB Output is correct
19 Correct 12 ms 1912 KB Output is correct
20 Correct 13 ms 1912 KB Output is correct
21 Correct 13 ms 2040 KB Output is correct
22 Correct 14 ms 2040 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 380 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 380 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 376 KB Output is correct
22 Correct 2 ms 376 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 2 ms 376 KB Output is correct
25 Correct 2 ms 376 KB Output is correct
26 Correct 172 ms 1476 KB Output is correct
27 Correct 79 ms 3244 KB Output is correct
28 Correct 170 ms 1348 KB Output is correct
29 Correct 80 ms 3324 KB Output is correct
30 Correct 173 ms 1348 KB Output is correct
31 Correct 76 ms 3192 KB Output is correct
32 Correct 172 ms 1348 KB Output is correct
33 Correct 77 ms 3200 KB Output is correct
34 Correct 21 ms 1976 KB Output is correct
35 Correct 78 ms 3156 KB Output is correct
36 Correct 174 ms 1348 KB Output is correct
37 Correct 77 ms 3196 KB Output is correct
38 Correct 176 ms 1396 KB Output is correct
39 Correct 77 ms 3196 KB Output is correct
40 Correct 189 ms 1348 KB Output is correct
41 Correct 78 ms 3196 KB Output is correct
42 Correct 176 ms 1320 KB Output is correct
43 Correct 81 ms 3324 KB Output is correct
44 Correct 175 ms 1348 KB Output is correct
45 Correct 77 ms 3196 KB Output is correct
46 Correct 170 ms 1348 KB Output is correct
47 Correct 4 ms 632 KB Output is correct
48 Correct 47 ms 1016 KB Output is correct
49 Correct 48 ms 1144 KB Output is correct
50 Correct 489 ms 3284 KB Output is correct
51 Correct 486 ms 3572 KB Output is correct
52 Correct 13 ms 1912 KB Output is correct
53 Correct 15 ms 2012 KB Output is correct
54 Correct 13 ms 1912 KB Output is correct
55 Correct 12 ms 1912 KB Output is correct
56 Correct 13 ms 1912 KB Output is correct
57 Correct 12 ms 1912 KB Output is correct
58 Correct 13 ms 1912 KB Output is correct
59 Correct 12 ms 1912 KB Output is correct
60 Correct 15 ms 1912 KB Output is correct
61 Correct 12 ms 1912 KB Output is correct
62 Correct 13 ms 1912 KB Output is correct
63 Correct 12 ms 1912 KB Output is correct
64 Correct 13 ms 2040 KB Output is correct
65 Correct 14 ms 1912 KB Output is correct
66 Correct 12 ms 1912 KB Output is correct
67 Correct 13 ms 1912 KB Output is correct
68 Correct 12 ms 1912 KB Output is correct
69 Correct 13 ms 1912 KB Output is correct
70 Correct 12 ms 1912 KB Output is correct
71 Correct 13 ms 1912 KB Output is correct
72 Correct 13 ms 2040 KB Output is correct
73 Correct 14 ms 2040 KB Output is correct
74 Execution timed out 3045 ms 7872 KB Time limit exceeded
75 Halted 0 ms 0 KB -