oj.uz

Submission #224709

# Submission time Handle Problem Language Result Execution time Memory
224709 2020-04-18T16:04:11 Z DodgeBallMan Election Campaign (JOI15_election_campaign) C++14
100 / 100
 172 ms 24056 KB 
#include <bits/stdc++.h>
#define iii tuple<int, int, int>

using namespace std;

const int N = 1e5 + 10;

vector<iii> path[N];
vector<int> g[N];
int sz[N], par[N], dp[N], dep[N], rot[N], pos[N], n, q, sum[2][N], key[N];

void dfs( int u, int p ) {
    if( p != 0 ) g[u].erase( find( g[u].begin(), g[u].end(), p ) );
    par[u] = p, sz[u] = 1, dep[u] = dep[p] + 1;
    for( int &v : g[u] ) if( v != p ) {
        dfs( v, u );
        sz[u] += sz[v];
        if( sz[v] > sz[g[u][0]] ) swap( v, g[u][0] );
    }
}

void hld( int u ) {
    static int idx = 0;
    if( par[u] == 0 || g[par[u]][0] != u ) rot[u] = u;
    else rot[u] = rot[par[u]];
    pos[u] = ++idx;
    key[idx] = u;
    for( int v : g[u] ) hld( v );
}

int queryhld( int ty, int a, int b ) {
    int ret = 0, mi;
    while( rot[a] != rot[b] ) {
        if( dep[rot[a]] < dep[rot[b]] ) swap( a, b );
        if( rot[key[pos[a]+1]] != rot[a] ) mi = 0;
        else mi = sum[ty][pos[a]+1];
        ret += sum[ty][pos[rot[a]]] - mi;
        a = par[rot[a]];
    }
    if( dep[b] < dep[a] ) swap( a, b );
    if( rot[key[pos[b]+1]] != rot[b] ) mi = 0;
    else mi = sum[ty][pos[b]+1];
    ret += sum[ty][pos[a]] - mi;
    return ret;
}

int lca( int a, int b ) {
     while( rot[a] != rot[b] ) {
        if( dep[rot[a]] < dep[rot[b]] ) swap( a, b );
        a = par[rot[a]];
    }
    if( dep[b] < dep[a] ) return b;
    else return a;
}

void updt( int ty, int u, int va ) {
    if( rot[key[pos[u]+1]] != rot[u] ) sum[ty][pos[u]] = va;
    else sum[ty][pos[u]] = sum[ty][pos[u]+1] + va;
}

void solve( int u, int p ) {
    for( int v : g[u] ) if( v != p ) {
        solve( v, u );
        dp[u] += dp[v];
    }   
    updt( 0, u, dp[u] );
    updt( 1, u, 0 );
    for( iii x : path[u] ) {
        int a, b, c;
        tie( a, b, c ) = x;
        dp[u] = max( dp[u], c + queryhld( 0, a, b ) - queryhld( 1, a, b ) );
    }
    updt( 1, u, dp[u] );
}

int main()
{
    scanf("%d",&n);
    for( int i = 1, a, b ; i < n ; i++ ) {
        scanf("%d %d",&a,&b);
        g[a].emplace_back( b ), g[b].emplace_back( a );
    }
    dfs( 1, 0 ), hld( 1 );
    scanf("%d",&q);
    for( int i = 1, a, b, c ; i <= q ; i++ ) {
        scanf("%d %d %d",&a,&b,&c);
        int x = lca( a, b );
        path[x].emplace_back( a, b, c );
    }
    solve( 1, 0 );
    printf("%d",dp[1]);
    return 0;
}

Compilation message

election_campaign.cpp: In function 'int main()':
election_campaign.cpp:78:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
election_campaign.cpp:80:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&a,&b);
         ~~~~~^~~~~~~~~~~~~~~
election_campaign.cpp:84:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&q);
     ~~~~~^~~~~~~~~
election_campaign.cpp:86:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d",&a,&b,&c);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 7 ms 5096 KB Output is correct
5 Correct 82 ms 12664 KB Output is correct
6 Correct 57 ms 21880 KB Output is correct
7 Correct 69 ms 18552 KB Output is correct
8 Correct 60 ms 12664 KB Output is correct
9 Correct 67 ms 16764 KB Output is correct
10 Correct 56 ms 12536 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 8 ms 5248 KB Output is correct
4 Correct 104 ms 23800 KB Output is correct
5 Correct 107 ms 23928 KB Output is correct
6 Correct 103 ms 23928 KB Output is correct
7 Correct 103 ms 23800 KB Output is correct
8 Correct 103 ms 23800 KB Output is correct
9 Correct 105 ms 23800 KB Output is correct
10 Correct 104 ms 23844 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 8 ms 5248 KB Output is correct
4 Correct 104 ms 23800 KB Output is correct
5 Correct 107 ms 23928 KB Output is correct
6 Correct 103 ms 23928 KB Output is correct
7 Correct 103 ms 23800 KB Output is correct
8 Correct 103 ms 23800 KB Output is correct
9 Correct 105 ms 23800 KB Output is correct
10 Correct 104 ms 23844 KB Output is correct
11 Correct 17 ms 6016 KB Output is correct
12 Correct 109 ms 23776 KB Output is correct
13 Correct 107 ms 23928 KB Output is correct
14 Correct 108 ms 23804 KB Output is correct
15 Correct 111 ms 23932 KB Output is correct
16 Correct 105 ms 23800 KB Output is correct
17 Correct 106 ms 23800 KB Output is correct
18 Correct 106 ms 23800 KB Output is correct
19 Correct 111 ms 24056 KB Output is correct
20 Correct 113 ms 23928 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 172 ms 14128 KB Output is correct
2 Correct 114 ms 23800 KB Output is correct
3 Correct 143 ms 20856 KB Output is correct
4 Correct 104 ms 14000 KB Output is correct
5 Correct 129 ms 19480 KB Output is correct
6 Correct 103 ms 13932 KB Output is correct
7 Correct 134 ms 19124 KB Output is correct
8 Correct 158 ms 14328 KB Output is correct
9 Correct 102 ms 23672 KB Output is correct
10 Correct 127 ms 17968 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 7 ms 5096 KB Output is correct
5 Correct 82 ms 12664 KB Output is correct
6 Correct 57 ms 21880 KB Output is correct
7 Correct 69 ms 18552 KB Output is correct
8 Correct 60 ms 12664 KB Output is correct
9 Correct 67 ms 16764 KB Output is correct
10 Correct 56 ms 12536 KB Output is correct
11 Correct 8 ms 5120 KB Output is correct
12 Correct 8 ms 5248 KB Output is correct
13 Correct 8 ms 5248 KB Output is correct
14 Correct 9 ms 5248 KB Output is correct
15 Correct 8 ms 5120 KB Output is correct
16 Correct 8 ms 5248 KB Output is correct
17 Correct 8 ms 5248 KB Output is correct
18 Correct 8 ms 5248 KB Output is correct
19 Correct 8 ms 5248 KB Output is correct
20 Correct 8 ms 5248 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 7 ms 5096 KB Output is correct
5 Correct 82 ms 12664 KB Output is correct
6 Correct 57 ms 21880 KB Output is correct
7 Correct 69 ms 18552 KB Output is correct
8 Correct 60 ms 12664 KB Output is correct
9 Correct 67 ms 16764 KB Output is correct
10 Correct 56 ms 12536 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 5120 KB Output is correct
13 Correct 8 ms 5248 KB Output is correct
14 Correct 104 ms 23800 KB Output is correct
15 Correct 107 ms 23928 KB Output is correct
16 Correct 103 ms 23928 KB Output is correct
17 Correct 103 ms 23800 KB Output is correct
18 Correct 103 ms 23800 KB Output is correct
19 Correct 105 ms 23800 KB Output is correct
20 Correct 104 ms 23844 KB Output is correct
21 Correct 17 ms 6016 KB Output is correct
22 Correct 109 ms 23776 KB Output is correct
23 Correct 107 ms 23928 KB Output is correct
24 Correct 108 ms 23804 KB Output is correct
25 Correct 111 ms 23932 KB Output is correct
26 Correct 105 ms 23800 KB Output is correct
27 Correct 106 ms 23800 KB Output is correct
28 Correct 106 ms 23800 KB Output is correct
29 Correct 111 ms 24056 KB Output is correct
30 Correct 113 ms 23928 KB Output is correct
31 Correct 172 ms 14128 KB Output is correct
32 Correct 114 ms 23800 KB Output is correct
33 Correct 143 ms 20856 KB Output is correct
34 Correct 104 ms 14000 KB Output is correct
35 Correct 129 ms 19480 KB Output is correct
36 Correct 103 ms 13932 KB Output is correct
37 Correct 134 ms 19124 KB Output is correct
38 Correct 158 ms 14328 KB Output is correct
39 Correct 102 ms 23672 KB Output is correct
40 Correct 127 ms 17968 KB Output is correct
41 Correct 8 ms 5120 KB Output is correct
42 Correct 8 ms 5248 KB Output is correct
43 Correct 8 ms 5248 KB Output is correct
44 Correct 9 ms 5248 KB Output is correct
45 Correct 8 ms 5120 KB Output is correct
46 Correct 8 ms 5248 KB Output is correct
47 Correct 8 ms 5248 KB Output is correct
48 Correct 8 ms 5248 KB Output is correct
49 Correct 8 ms 5248 KB Output is correct
50 Correct 8 ms 5248 KB Output is correct
51 Correct 162 ms 14204 KB Output is correct
52 Correct 107 ms 23672 KB Output is correct
53 Correct 137 ms 18096 KB Output is correct
54 Correct 115 ms 14004 KB Output is correct
55 Correct 167 ms 14000 KB Output is correct
56 Correct 106 ms 23928 KB Output is correct
57 Correct 131 ms 18816 KB Output is correct
58 Correct 105 ms 13872 KB Output is correct
59 Correct 156 ms 14200 KB Output is correct
60 Correct 114 ms 23956 KB Output is correct
61 Correct 135 ms 19064 KB Output is correct
62 Correct 107 ms 13780 KB Output is correct
63 Correct 167 ms 13792 KB Output is correct
64 Correct 115 ms 23800 KB Output is correct
65 Correct 132 ms 18868 KB Output is correct
66 Correct 105 ms 14004 KB Output is correct
67 Correct 167 ms 13932 KB Output is correct
68 Correct 107 ms 23672 KB Output is correct
69 Correct 131 ms 17656 KB Output is correct
70 Correct 105 ms 14172 KB Output is correct