oj.uz

답안 #224676

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
224676 2020-04-18T14:58:44 Z DodgeBallMan Election Campaign (JOI15_election_campaign) C++14
30 / 100
 1000 ms 30468 KB 
#include <bits/stdc++.h>
#define iii tuple<int, int, long long>

using namespace std;

const int N = 1e5 + 10;

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

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 );
        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;
    for( int v : g[u] ) hld( v );
}

long long query( vector<long long> &t, int ll, int rr, int l = 1, int r = n, int idx = 1 ) {
    if( l > rr || r < ll ) return 0;
    if( l >= ll && r <= rr ) return t[idx];
    int mid = l + r >> 1;
    return query( t, ll, rr, l, mid, idx<<1 ) + query( t, ll, rr, mid+1, r, idx<<1|1 );
}

void update( vector<long long> &t, int x, long long va, int l = 1, int r = n, int idx = 1 ) {
    //printf("%d %d %d\n",l,r,x);
    if( l > x || r < x ) return ;
    if( l == r ) return void( t[idx] = va );
    int mid = l + r >> 1;
    update( t, x, va, l, mid, idx<<1 ), update( t, x, va, mid+1, r, idx<<1|1 );
    t[idx] = t[idx<<1] + t[idx<<1|1];
}

long long queryhld( int ty, int a, int b ) {
    long long ret = 0;
    while( rot[a] != rot[b] ) {
        if( dep[rot[a]] < dep[rot[b]] ) swap( a, b );
        ret += query( t[ty], pos[rot[a]], pos[a] );
        a = par[rot[a]];
    }
    if( dep[b] < dep[a] ) swap( a, b );
    ret += query( t[ty], pos[a], pos[b] );
    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 solve( int u, int p ) {
    //printf("%d %d\n",u,p);
    for( int v : g[u] ) if( v != p ) {
        solve( v, u );
        dp[u] += dp[v];
    }   
    update( t[0], pos[u], dp[u] );
    //printf("HH");
    for( iii x : path[u] ) {
        int a, b;
        long long c;
        tie( a, b, c ) = x;
        dp[u] = max( dp[u], c + queryhld( 0, a, b ) - queryhld( 1, a, b ) );
    }
    update( t[1], pos[u], dp[u] );
    //printf("U: %d %lld\n",u,dp[u]);
}

int main()
{
    t[0].resize( 4*N ), t[1].resize( 4*N );
    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 ; i <= q ; i++ ) {
        long long c;
        scanf("%d %d %lld",&a,&b,&c);
        int x = lca( a, b );
        path[x].emplace_back( a, b, c );
        //printf("%d %d %d\n",x,a,b);
    }
    solve( 1, 0 );
    printf("%lld",dp[1]);
    return 0;
}

Compilation message

election_campaign.cpp: In function 'long long int query(std::vector<long long int>&, int, int, int, int, int)':
election_campaign.cpp:34:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
election_campaign.cpp: In function 'void update(std::vector<long long int>&, int, long long int, int, int, int)':
election_campaign.cpp:42:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:89:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
election_campaign.cpp:91:14: 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:95:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&q);
     ~~~~~^~~~~~~~~
election_campaign.cpp:98:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %lld",&a,&b,&c);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 11264 KB Output is correct
2 Correct 10 ms 11392 KB Output is correct
3 Correct 10 ms 11264 KB Output is correct
4 Correct 11 ms 11392 KB Output is correct
5 Correct 131 ms 18424 KB Output is correct
6 Correct 94 ms 26104 KB Output is correct
7 Correct 127 ms 23416 KB Output is correct
8 Correct 117 ms 18040 KB Output is correct
9 Correct 156 ms 21880 KB Output is correct
10 Correct 113 ms 18040 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 11264 KB Output is correct
2 Correct 11 ms 11392 KB Output is correct
3 Correct 13 ms 11648 KB Output is correct
4 Correct 223 ms 29972 KB Output is correct
5 Correct 201 ms 30072 KB Output is correct
6 Correct 180 ms 30072 KB Output is correct
7 Correct 226 ms 29944 KB Output is correct
8 Correct 201 ms 29944 KB Output is correct
9 Correct 200 ms 30072 KB Output is correct
10 Correct 221 ms 29944 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 11264 KB Output is correct
2 Correct 11 ms 11392 KB Output is correct
3 Correct 13 ms 11648 KB Output is correct
4 Correct 223 ms 29972 KB Output is correct
5 Correct 201 ms 30072 KB Output is correct
6 Correct 180 ms 30072 KB Output is correct
7 Correct 226 ms 29944 KB Output is correct
8 Correct 201 ms 29944 KB Output is correct
9 Correct 200 ms 30072 KB Output is correct
10 Correct 221 ms 29944 KB Output is correct
11 Correct 26 ms 12288 KB Output is correct
12 Correct 207 ms 30224 KB Output is correct
13 Correct 223 ms 30328 KB Output is correct
14 Correct 191 ms 30328 KB Output is correct
15 Correct 213 ms 30328 KB Output is correct
16 Correct 187 ms 30328 KB Output is correct
17 Correct 204 ms 30328 KB Output is correct
18 Correct 205 ms 30468 KB Output is correct
19 Correct 190 ms 30328 KB Output is correct
20 Correct 202 ms 30328 KB Output is correct

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 844 ms 21868 KB Output is correct
2 Correct 182 ms 30296 KB Output is correct
3 Execution timed out 1094 ms 22012 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 11264 KB Output is correct
2 Correct 10 ms 11392 KB Output is correct
3 Correct 10 ms 11264 KB Output is correct
4 Correct 11 ms 11392 KB Output is correct
5 Correct 131 ms 18424 KB Output is correct
6 Correct 94 ms 26104 KB Output is correct
7 Correct 127 ms 23416 KB Output is correct
8 Correct 117 ms 18040 KB Output is correct
9 Correct 156 ms 21880 KB Output is correct
10 Correct 113 ms 18040 KB Output is correct
11 Correct 13 ms 11392 KB Output is correct
12 Correct 11 ms 11520 KB Output is correct
13 Correct 11 ms 11520 KB Output is correct
14 Correct 13 ms 11392 KB Output is correct
15 Correct 13 ms 11392 KB Output is correct
16 Correct 13 ms 11392 KB Output is correct
17 Correct 13 ms 11392 KB Output is correct
18 Correct 20 ms 11520 KB Output is correct
19 Correct 12 ms 11520 KB Output is correct
20 Correct 11 ms 11520 KB Output is correct

Subtask #6
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 11264 KB Output is correct
2 Correct 10 ms 11392 KB Output is correct
3 Correct 10 ms 11264 KB Output is correct
4 Correct 11 ms 11392 KB Output is correct
5 Correct 131 ms 18424 KB Output is correct
6 Correct 94 ms 26104 KB Output is correct
7 Correct 127 ms 23416 KB Output is correct
8 Correct 117 ms 18040 KB Output is correct
9 Correct 156 ms 21880 KB Output is correct
10 Correct 113 ms 18040 KB Output is correct
11 Correct 12 ms 11264 KB Output is correct
12 Correct 11 ms 11392 KB Output is correct
13 Correct 13 ms 11648 KB Output is correct
14 Correct 223 ms 29972 KB Output is correct
15 Correct 201 ms 30072 KB Output is correct
16 Correct 180 ms 30072 KB Output is correct
17 Correct 226 ms 29944 KB Output is correct
18 Correct 201 ms 29944 KB Output is correct
19 Correct 200 ms 30072 KB Output is correct
20 Correct 221 ms 29944 KB Output is correct
21 Correct 26 ms 12288 KB Output is correct
22 Correct 207 ms 30224 KB Output is correct
23 Correct 223 ms 30328 KB Output is correct
24 Correct 191 ms 30328 KB Output is correct
25 Correct 213 ms 30328 KB Output is correct
26 Correct 187 ms 30328 KB Output is correct
27 Correct 204 ms 30328 KB Output is correct
28 Correct 205 ms 30468 KB Output is correct
29 Correct 190 ms 30328 KB Output is correct
30 Correct 202 ms 30328 KB Output is correct
31 Correct 844 ms 21868 KB Output is correct
32 Correct 182 ms 30296 KB Output is correct
33 Execution timed out 1094 ms 22012 KB Time limit exceeded
34 Halted 0 ms 0 KB -