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Submission #494899

# Submission time Handle Problem Language Result Execution time Memory
494899 2021-12-17T10:57:29 Z fcmalkcin Tug of War (BOI15_tug) C++17
100 / 100
 442 ms 13400 KB 
#pragma GCC optimize("Ofast")
#pragma GCC optimization("unroll-loops, no-stack-protector")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
using namespace std;

#define ll  long long
#define pll pair<ll,ll>
#define ff first
#define ss second
#define pb push_back
#define endl "\n"
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

const ll maxn=3e5+21;
const ll mod=998244353   ;
const ll base=1e9+1000;

/// you will be the best but now you just are trash
/// goal 2/7

ll par[maxn];
ll cnt[maxn];
ll find_par(ll u)
{
    if (par[u]<0) return u;
    return par[u]=find_par(par[u]);
}
void dsu(ll x,ll y)
{
    x=find_par(x);
    y=find_par(y);
    if (x==y) return ;
    if (y>x) swap(x,y);
    cnt[y]+=cnt[x];
    par[y]+=par[x];
    par[x]=y;
}
vector<ll> adj[maxn];
bool dd[maxn];
ll n;
ll x[maxn];
ll y[maxn];
ll w[maxn];
ll pos;
ll cnta=0;
vector<ll> vt;
ll ed;
void dfs(ll u,ll par)
{
    ll nw=par;
    dd[u]=1;
    vt.pb(u);
    for (auto id:adj[u])
    {
        ll to=x[id]+y[id]-u;
        if (to==nw)
        {
            nw=-1;
            continue;
        }
        if (dd[to])
        {
            ed=id;
        }
        else
        {
            dfs(to,u);
        }
    }
}
void dfs1(ll u,ll par)
{
    for (auto id:adj[u])
    {
       if (id==ed) continue;
       ll to=x[id]+y[id]-u;
       if (to==par) continue;
       if (to<=n) cnta+=w[id];
       dfs1(to,u);
    }
}


int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    if (fopen("t.inp", "r"))
    {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll k;
    cin>> n>> k;
    for (int i=1;i<=2*n;i++)
    {
        par[i]=-1;
    }
    ll all=0;
    for (int i=1;i<=2*n;i++)
    {
        cin>>x[i]>>y[i]>>w[i];
        all+=w[i];
        y[i]+=n;
        adj[x[i]].pb(i);
        adj[y[i]].pb(i);
        dsu(x[i],y[i]);
        cnt[find_par(x[i])]++;
    }
    vector<ll> vt;
    ll nw=0;
    bitset<600002> bs;
    bs[0]=1;

    for (int i=1;i<=2*n;i++)
    {
        if (i==find_par(i))
        {
            if (cnt[i]!=-par[i])
            {
                cout <<"NO";
                return 0;
            }
            cnta=0;
            ed=-1;
            dfs(i,0);
            assert(ed!=-1);
            dfs1(x[ed],0);
            ll f=cnta+w[ed];
            cnta=0;
            dfs1(y[ed],0);
            ll l=cnta;
            if (f>l) swap(l,f);

            nw+=f;
            bs|=(bs<<(l-f));
        }
    }
    for (int i=0;i<=600000;i++)
    {
        if (bs[i])
        {
            ll vala=nw+i;
            if (abs(vala-(all-vala))<=k)
            {
                cout <<"YES";
                return 0;
            }
        }
    }
    cout <<"NO";
}
/*11 1 4
2 14 10 3 15 6 1 2 9 10 9
1 9*/

Compilation message

tug.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization("unroll-loops, no-stack-protector")
      | 
tug.cpp: In function 'int main()':
tug.cpp:93:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
tug.cpp:94:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 7504 KB Output is correct
2 Correct 4 ms 7632 KB Output is correct
3 Correct 5 ms 7592 KB Output is correct
4 Correct 4 ms 7504 KB Output is correct
5 Correct 5 ms 7504 KB Output is correct
6 Correct 5 ms 7632 KB Output is correct
7 Correct 5 ms 7504 KB Output is correct
8 Correct 5 ms 7504 KB Output is correct
9 Correct 5 ms 7632 KB Output is correct
10 Correct 5 ms 7504 KB Output is correct
11 Correct 4 ms 7600 KB Output is correct
12 Correct 4 ms 7504 KB Output is correct
13 Correct 5 ms 7504 KB Output is correct
14 Correct 5 ms 7504 KB Output is correct
15 Correct 4 ms 7600 KB Output is correct
16 Correct 5 ms 7504 KB Output is correct
17 Correct 5 ms 7608 KB Output is correct
18 Correct 5 ms 7504 KB Output is correct
19 Correct 4 ms 7632 KB Output is correct
20 Correct 5 ms 7592 KB Output is correct
21 Correct 5 ms 7504 KB Output is correct
22 Correct 5 ms 7588 KB Output is correct
23 Correct 5 ms 7632 KB Output is correct
24 Correct 5 ms 7600 KB Output is correct
25 Correct 5 ms 7596 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 7504 KB Output is correct
2 Correct 4 ms 7632 KB Output is correct
3 Correct 5 ms 7592 KB Output is correct
4 Correct 4 ms 7504 KB Output is correct
5 Correct 5 ms 7504 KB Output is correct
6 Correct 5 ms 7632 KB Output is correct
7 Correct 5 ms 7504 KB Output is correct
8 Correct 5 ms 7504 KB Output is correct
9 Correct 5 ms 7632 KB Output is correct
10 Correct 5 ms 7504 KB Output is correct
11 Correct 4 ms 7600 KB Output is correct
12 Correct 4 ms 7504 KB Output is correct
13 Correct 5 ms 7504 KB Output is correct
14 Correct 5 ms 7504 KB Output is correct
15 Correct 4 ms 7600 KB Output is correct
16 Correct 5 ms 7504 KB Output is correct
17 Correct 5 ms 7608 KB Output is correct
18 Correct 5 ms 7504 KB Output is correct
19 Correct 4 ms 7632 KB Output is correct
20 Correct 5 ms 7592 KB Output is correct
21 Correct 5 ms 7504 KB Output is correct
22 Correct 5 ms 7588 KB Output is correct
23 Correct 5 ms 7632 KB Output is correct
24 Correct 5 ms 7600 KB Output is correct
25 Correct 5 ms 7596 KB Output is correct
26 Correct 30 ms 7996 KB Output is correct
27 Correct 10 ms 7980 KB Output is correct
28 Correct 32 ms 7972 KB Output is correct
29 Correct 10 ms 8016 KB Output is correct
30 Correct 34 ms 7944 KB Output is correct
31 Correct 11 ms 7896 KB Output is correct
32 Correct 30 ms 7996 KB Output is correct
33 Correct 10 ms 8016 KB Output is correct
34 Correct 8 ms 7888 KB Output is correct
35 Correct 13 ms 7988 KB Output is correct
36 Correct 31 ms 7972 KB Output is correct
37 Correct 11 ms 7992 KB Output is correct
38 Correct 31 ms 7988 KB Output is correct
39 Correct 10 ms 7888 KB Output is correct
40 Correct 31 ms 7972 KB Output is correct
41 Correct 11 ms 7892 KB Output is correct
42 Correct 32 ms 7992 KB Output is correct
43 Correct 10 ms 7972 KB Output is correct
44 Correct 35 ms 7988 KB Output is correct
45 Correct 11 ms 7888 KB Output is correct
46 Correct 31 ms 7964 KB Output is correct
47 Correct 7 ms 7888 KB Output is correct
48 Correct 18 ms 8020 KB Output is correct
49 Correct 21 ms 8032 KB Output is correct
50 Correct 30 ms 7880 KB Output is correct
51 Correct 30 ms 7888 KB Output is correct

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 82 ms 9508 KB Output is correct
2 Correct 13 ms 9228 KB Output is correct
3 Correct 78 ms 9500 KB Output is correct
4 Correct 12 ms 9288 KB Output is correct
5 Correct 79 ms 9540 KB Output is correct
6 Correct 12 ms 9264 KB Output is correct
7 Correct 85 ms 9576 KB Output is correct
8 Correct 13 ms 9300 KB Output is correct
9 Correct 79 ms 9528 KB Output is correct
10 Correct 12 ms 9288 KB Output is correct
11 Correct 83 ms 9564 KB Output is correct
12 Correct 13 ms 9280 KB Output is correct
13 Correct 78 ms 9512 KB Output is correct
14 Correct 83 ms 9512 KB Output is correct
15 Correct 12 ms 9288 KB Output is correct
16 Correct 90 ms 9548 KB Output is correct
17 Correct 13 ms 9296 KB Output is correct
18 Correct 80 ms 9560 KB Output is correct
19 Correct 13 ms 9276 KB Output is correct
20 Correct 80 ms 9512 KB Output is correct
21 Correct 13 ms 9208 KB Output is correct
22 Correct 54 ms 9628 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 7504 KB Output is correct
2 Correct 4 ms 7632 KB Output is correct
3 Correct 5 ms 7592 KB Output is correct
4 Correct 4 ms 7504 KB Output is correct
5 Correct 5 ms 7504 KB Output is correct
6 Correct 5 ms 7632 KB Output is correct
7 Correct 5 ms 7504 KB Output is correct
8 Correct 5 ms 7504 KB Output is correct
9 Correct 5 ms 7632 KB Output is correct
10 Correct 5 ms 7504 KB Output is correct
11 Correct 4 ms 7600 KB Output is correct
12 Correct 4 ms 7504 KB Output is correct
13 Correct 5 ms 7504 KB Output is correct
14 Correct 5 ms 7504 KB Output is correct
15 Correct 4 ms 7600 KB Output is correct
16 Correct 5 ms 7504 KB Output is correct
17 Correct 5 ms 7608 KB Output is correct
18 Correct 5 ms 7504 KB Output is correct
19 Correct 4 ms 7632 KB Output is correct
20 Correct 5 ms 7592 KB Output is correct
21 Correct 5 ms 7504 KB Output is correct
22 Correct 5 ms 7588 KB Output is correct
23 Correct 5 ms 7632 KB Output is correct
24 Correct 5 ms 7600 KB Output is correct
25 Correct 5 ms 7596 KB Output is correct
26 Correct 30 ms 7996 KB Output is correct
27 Correct 10 ms 7980 KB Output is correct
28 Correct 32 ms 7972 KB Output is correct
29 Correct 10 ms 8016 KB Output is correct
30 Correct 34 ms 7944 KB Output is correct
31 Correct 11 ms 7896 KB Output is correct
32 Correct 30 ms 7996 KB Output is correct
33 Correct 10 ms 8016 KB Output is correct
34 Correct 8 ms 7888 KB Output is correct
35 Correct 13 ms 7988 KB Output is correct
36 Correct 31 ms 7972 KB Output is correct
37 Correct 11 ms 7992 KB Output is correct
38 Correct 31 ms 7988 KB Output is correct
39 Correct 10 ms 7888 KB Output is correct
40 Correct 31 ms 7972 KB Output is correct
41 Correct 11 ms 7892 KB Output is correct
42 Correct 32 ms 7992 KB Output is correct
43 Correct 10 ms 7972 KB Output is correct
44 Correct 35 ms 7988 KB Output is correct
45 Correct 11 ms 7888 KB Output is correct
46 Correct 31 ms 7964 KB Output is correct
47 Correct 7 ms 7888 KB Output is correct
48 Correct 18 ms 8020 KB Output is correct
49 Correct 21 ms 8032 KB Output is correct
50 Correct 30 ms 7880 KB Output is correct
51 Correct 30 ms 7888 KB Output is correct
52 Correct 82 ms 9508 KB Output is correct
53 Correct 13 ms 9228 KB Output is correct
54 Correct 78 ms 9500 KB Output is correct
55 Correct 12 ms 9288 KB Output is correct
56 Correct 79 ms 9540 KB Output is correct
57 Correct 12 ms 9264 KB Output is correct
58 Correct 85 ms 9576 KB Output is correct
59 Correct 13 ms 9300 KB Output is correct
60 Correct 79 ms 9528 KB Output is correct
61 Correct 12 ms 9288 KB Output is correct
62 Correct 83 ms 9564 KB Output is correct
63 Correct 13 ms 9280 KB Output is correct
64 Correct 78 ms 9512 KB Output is correct
65 Correct 83 ms 9512 KB Output is correct
66 Correct 12 ms 9288 KB Output is correct
67 Correct 90 ms 9548 KB Output is correct
68 Correct 13 ms 9296 KB Output is correct
69 Correct 80 ms 9560 KB Output is correct
70 Correct 13 ms 9276 KB Output is correct
71 Correct 80 ms 9512 KB Output is correct
72 Correct 13 ms 9208 KB Output is correct
73 Correct 54 ms 9628 KB Output is correct
74 Correct 406 ms 13144 KB Output is correct
75 Correct 63 ms 13020 KB Output is correct
76 Correct 418 ms 13060 KB Output is correct
77 Correct 63 ms 13104 KB Output is correct
78 Correct 431 ms 13224 KB Output is correct
79 Correct 397 ms 13100 KB Output is correct
80 Correct 61 ms 13108 KB Output is correct
81 Correct 67 ms 13036 KB Output is correct
82 Correct 403 ms 13028 KB Output is correct
83 Correct 431 ms 13160 KB Output is correct
84 Correct 58 ms 13124 KB Output is correct
85 Correct 424 ms 13096 KB Output is correct
86 Correct 68 ms 13128 KB Output is correct
87 Correct 421 ms 13044 KB Output is correct
88 Correct 72 ms 13128 KB Output is correct
89 Correct 403 ms 13028 KB Output is correct
90 Correct 62 ms 13108 KB Output is correct
91 Correct 427 ms 13112 KB Output is correct
92 Correct 61 ms 13044 KB Output is correct
93 Correct 425 ms 13108 KB Output is correct
94 Correct 34 ms 12616 KB Output is correct
95 Correct 248 ms 13356 KB Output is correct
96 Correct 236 ms 13400 KB Output is correct
97 Correct 418 ms 13060 KB Output is correct
98 Correct 442 ms 13284 KB Output is correct