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답안 #287852

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
287852 2020-09-01T04:47:49 Z 문홍윤(#5789) Election Campaign (JOI15_election_campaign) C++17
100 / 100
 278 ms 30844 KB 
#include <bits/stdc++.h>
#define eb emplace_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;

struct FENWICK{
    LL tree[100010];
    LL sum(int i){
        LL ans=0;
        while(i){
            ans+=tree[i];
            i-=(i&-i);
        }
        return ans;
    }
    void update(int i, LL num){
        while(i<=100000){
            tree[i]+=num;
            i+=(i&-i);
        }
    }
}fen;

int n, m;
vector<int> inp[100010], link[100010];
vector<pair<pii, LL> > qu[100010];
int sz[100010], d[100010], p[100010];

void dfs1(int num, int par){
    sz[num]=1;
    p[num]=par;
    d[num]=d[par]+1;
    for(auto i:inp[num]){
        if(i==par)continue;
        dfs1(i, num);
        link[num].eb(i);
        sz[num]+=sz[i];
    }
}

int eul[100010], fin[100010], re;
int col[100010], ctp[100010], cre;
LL dp[100010];

bool cmp(int a, int b){return sz[a]>sz[b];}
void dfs2(int num, int c){
    sort(all(link[num]), cmp);
    eul[num]=fin[num]=++re;
    col[num]=c;
    for(int i=0; i<link[num].size(); i++){
        if(i){
            ctp[++cre]=link[num][i];
            dfs2(link[num][i], cre);
        }
        else dfs2(link[num][i], c);
        fin[num]=fin[link[num][i]];
    }
}
int lca(int a, int b){
    if(col[a]==col[b]){
        if(eul[a]<eul[b])return a;
        return b;
    }
    if(col[a]>col[b])swap(a, b);
    return lca(a, p[ctp[col[b]]]);
}

LL query(int num, int a, int b){
    vector<pii> vc;
    while(1){
        if(a==num)break;
        if(col[a]==col[num]){
            vc.eb(eul[num]+1, eul[a]);
            break;
        }
        vc.eb(eul[ctp[col[a]]], eul[a]);
        a=p[ctp[col[a]]];
    }
    while(1){
        if(b==num)break;
        if(col[b]==col[num]){
            vc.eb(eul[num]+1, eul[b]);
            break;
        }
        vc.eb(eul[ctp[col[b]]], eul[b]);
        b=p[ctp[col[b]]];
    }
    int st=eul[num];
    sort(all(vc));
    LL ret=0;
    for(auto i:vc){
        ret+=fen.sum(i.F-1)-fen.sum(st);
        st=i.S;
    }
    ret+=fen.sum(fin[num])-fen.sum(st);
    return ret;
}

void dfs3(int num){
    LL tmp=0;
    for(auto i:link[num]){
        dfs3(i);
        tmp+=dp[i];
    }
    dp[num]=tmp;
    for(auto i:qu[num]){
        LL tmp2=query(num, i.F.F, i.F.S);
        dp[num]=max(dp[num], tmp2+i.S);
    }
    fen.update(eul[num], dp[num]-tmp);
}

int main(){
    scanf("%d", &n);
    for(int i=1; i<n; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        inp[a].eb(b);
        inp[b].eb(a);
    }
    dfs1(1, 0);
    ctp[++cre]=1;
    dfs2(1, cre);
    scanf("%d", &m);
    for(int i=1; i<=m; i++){
        int a, b; LL c;
        scanf("%d %d %lld", &a, &b, &c);
        qu[lca(a, b)].eb(mp(a, b), c);
    }
    dfs3(1);
    printf("%lld", dp[1]);
}

Compilation message

election_campaign.cpp: In function 'void dfs2(int, int)':
election_campaign.cpp:55:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for(int i=0; i<link[num].size(); i++){
      |                  ~^~~~~~~~~~~~~~~~~
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:119:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  119 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
election_campaign.cpp:122:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  122 |         scanf("%d %d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~
election_campaign.cpp:129:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  129 |     scanf("%d", &m);
      |     ~~~~~^~~~~~~~~~
election_campaign.cpp:132:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  132 |         scanf("%d %d %lld", &a, &b, &c);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 5 ms 7424 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct
4 Correct 5 ms 7552 KB Output is correct
5 Correct 115 ms 17528 KB Output is correct
6 Correct 65 ms 26488 KB Output is correct
7 Correct 101 ms 23160 KB Output is correct
8 Correct 76 ms 17016 KB Output is correct
9 Correct 103 ms 21472 KB Output is correct
10 Correct 74 ms 16888 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 6 ms 7680 KB Output is correct
4 Correct 131 ms 30456 KB Output is correct
5 Correct 131 ms 30584 KB Output is correct
6 Correct 130 ms 30456 KB Output is correct
7 Correct 132 ms 30584 KB Output is correct
8 Correct 132 ms 30456 KB Output is correct
9 Correct 132 ms 30456 KB Output is correct
10 Correct 132 ms 30328 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 6 ms 7680 KB Output is correct
4 Correct 131 ms 30456 KB Output is correct
5 Correct 131 ms 30584 KB Output is correct
6 Correct 130 ms 30456 KB Output is correct
7 Correct 132 ms 30584 KB Output is correct
8 Correct 132 ms 30456 KB Output is correct
9 Correct 132 ms 30456 KB Output is correct
10 Correct 132 ms 30328 KB Output is correct
11 Correct 19 ms 8568 KB Output is correct
12 Correct 136 ms 30712 KB Output is correct
13 Correct 135 ms 30712 KB Output is correct
14 Correct 135 ms 30844 KB Output is correct
15 Correct 138 ms 30712 KB Output is correct
16 Correct 141 ms 30784 KB Output is correct
17 Correct 133 ms 30712 KB Output is correct
18 Correct 143 ms 30660 KB Output is correct
19 Correct 135 ms 30712 KB Output is correct
20 Correct 140 ms 30712 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 269 ms 20968 KB Output is correct
2 Correct 129 ms 30456 KB Output is correct
3 Correct 197 ms 26612 KB Output is correct
4 Correct 169 ms 20464 KB Output is correct
5 Correct 193 ms 26100 KB Output is correct
6 Correct 163 ms 20196 KB Output is correct
7 Correct 197 ms 25968 KB Output is correct
8 Correct 229 ms 21112 KB Output is correct
9 Correct 128 ms 30456 KB Output is correct
10 Correct 189 ms 24940 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 5 ms 7424 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct
4 Correct 5 ms 7552 KB Output is correct
5 Correct 115 ms 17528 KB Output is correct
6 Correct 65 ms 26488 KB Output is correct
7 Correct 101 ms 23160 KB Output is correct
8 Correct 76 ms 17016 KB Output is correct
9 Correct 103 ms 21472 KB Output is correct
10 Correct 74 ms 16888 KB Output is correct
11 Correct 6 ms 7552 KB Output is correct
12 Correct 6 ms 7680 KB Output is correct
13 Correct 7 ms 7552 KB Output is correct
14 Correct 6 ms 7552 KB Output is correct
15 Correct 7 ms 7552 KB Output is correct
16 Correct 6 ms 7552 KB Output is correct
17 Correct 6 ms 7552 KB Output is correct
18 Correct 7 ms 7552 KB Output is correct
19 Correct 6 ms 7552 KB Output is correct
20 Correct 6 ms 7680 KB Output is correct

Subtask #6
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 5 ms 7424 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct
4 Correct 5 ms 7552 KB Output is correct
5 Correct 115 ms 17528 KB Output is correct
6 Correct 65 ms 26488 KB Output is correct
7 Correct 101 ms 23160 KB Output is correct
8 Correct 76 ms 17016 KB Output is correct
9 Correct 103 ms 21472 KB Output is correct
10 Correct 74 ms 16888 KB Output is correct
11 Correct 6 ms 7424 KB Output is correct
12 Correct 6 ms 7424 KB Output is correct
13 Correct 6 ms 7680 KB Output is correct
14 Correct 131 ms 30456 KB Output is correct
15 Correct 131 ms 30584 KB Output is correct
16 Correct 130 ms 30456 KB Output is correct
17 Correct 132 ms 30584 KB Output is correct
18 Correct 132 ms 30456 KB Output is correct
19 Correct 132 ms 30456 KB Output is correct
20 Correct 132 ms 30328 KB Output is correct
21 Correct 19 ms 8568 KB Output is correct
22 Correct 136 ms 30712 KB Output is correct
23 Correct 135 ms 30712 KB Output is correct
24 Correct 135 ms 30844 KB Output is correct
25 Correct 138 ms 30712 KB Output is correct
26 Correct 141 ms 30784 KB Output is correct
27 Correct 133 ms 30712 KB Output is correct
28 Correct 143 ms 30660 KB Output is correct
29 Correct 135 ms 30712 KB Output is correct
30 Correct 140 ms 30712 KB Output is correct
31 Correct 269 ms 20968 KB Output is correct
32 Correct 129 ms 30456 KB Output is correct
33 Correct 197 ms 26612 KB Output is correct
34 Correct 169 ms 20464 KB Output is correct
35 Correct 193 ms 26100 KB Output is correct
36 Correct 163 ms 20196 KB Output is correct
37 Correct 197 ms 25968 KB Output is correct
38 Correct 229 ms 21112 KB Output is correct
39 Correct 128 ms 30456 KB Output is correct
40 Correct 189 ms 24940 KB Output is correct
41 Correct 6 ms 7552 KB Output is correct
42 Correct 6 ms 7680 KB Output is correct
43 Correct 7 ms 7552 KB Output is correct
44 Correct 6 ms 7552 KB Output is correct
45 Correct 7 ms 7552 KB Output is correct
46 Correct 6 ms 7552 KB Output is correct
47 Correct 6 ms 7552 KB Output is correct
48 Correct 7 ms 7552 KB Output is correct
49 Correct 6 ms 7552 KB Output is correct
50 Correct 6 ms 7680 KB Output is correct
51 Correct 238 ms 21752 KB Output is correct
52 Correct 132 ms 30712 KB Output is correct
53 Correct 196 ms 25356 KB Output is correct
54 Correct 156 ms 20716 KB Output is correct
55 Correct 274 ms 21096 KB Output is correct
56 Correct 139 ms 30812 KB Output is correct
57 Correct 194 ms 26100 KB Output is correct
58 Correct 162 ms 20456 KB Output is correct
59 Correct 237 ms 21488 KB Output is correct
60 Correct 135 ms 30712 KB Output is correct
61 Correct 190 ms 25972 KB Output is correct
62 Correct 174 ms 20260 KB Output is correct
63 Correct 272 ms 20856 KB Output is correct
64 Correct 137 ms 30712 KB Output is correct
65 Correct 203 ms 25864 KB Output is correct
66 Correct 157 ms 20428 KB Output is correct
67 Correct 278 ms 20964 KB Output is correct
68 Correct 136 ms 30712 KB Output is correct
69 Correct 195 ms 24768 KB Output is correct
70 Correct 160 ms 20248 KB Output is correct