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Submission #240630

# Submission time Handle Problem Language Result Execution time Memory
240630 2020-06-20T10:05:18 Z mhy908 Rigged Roads (NOI19_riggedroads) C++14
100 / 100
 563 ms 69176 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()
#define svec(x) sort(x.begin(), x.end())
#define press(x) x.erase(unique(x.begin(), x.end()), x.end())
#define lb(x, v) lower_bound(x.begin(), x.end(), v)
#define ub(x, v) upper_bound(x.begin(), x.end(), v)
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;
typedef pair<LL, LL> pll;
typedef pair<int, LL> pil;
typedef pair<LL, int> pli;
const LL llinf=2000000000000000000;
const LL mod1=1000000007;
const LL mod2=998244353;
const int inf=2000000000;
int n, m, ans[300010];
pii edge[300010];
bool ch[300010];
vector<int> link[300010];
int d[300010], sp[300010][30], num, p[300010], cnt[300010];
void dfs(int num, int par){
    d[num]=d[par]+1, sp[num][0]=par, p[num]=num;
    for(auto i:link[num]){
        if(i!=par)dfs(i, num);
    }
}
int lca(int x, int y){
    if(d[x]>d[y])swap(x, y);
    for(int i=19; i>=0; i--){
        if(d[y]-d[x]>=(1<<i))y=sp[y][i];
    }
    if(x==y)return x;
    for(int i=19; i>=0; i--){
        if(sp[x][i]!=sp[y][i]){
            x=sp[x][i];
            y=sp[y][i];
        }
    }
    return sp[x][0];
}
int main(){
    scanf("%d %d", &n, &m);
    for(int i=1; i<=m; i++)scanf("%d %d", &edge[i].F, &edge[i].S);
    for(int i=1; i<n; i++){
        int a;
        scanf("%d", &a);
        ch[a]=true;
        link[edge[a].F].eb(edge[a].S);
        link[edge[a].S].eb(edge[a].F);
    }
    dfs(1, 0);
    for(int j=1; j<20; j++){
        for(int i=1; i<=n; i++)sp[i][j]=sp[sp[i][j-1]][j-1];
    }
    for(int i=1; i<=m; i++){
        if(d[edge[i].F]<d[edge[i].S])swap(edge[i].F, edge[i].S);
        if(ch[i])cnt[edge[i].F]=i;
    }
    for(int i=1; i<=m; i++){
        if(ans[i])continue;
        if(ch[i]){
            ans[i]=++num;
            p[edge[i].F]=p[edge[i].S];
            continue;
        }
        int l=lca(edge[i].F, edge[i].S);
        int a=p[edge[i].F], b=p[edge[i].S];
        vector<int> vc;
        while(d[a]>d[l]){vc.eb(cnt[a]); p[a]=p[l]; a=p[sp[a][0]];}
        while(d[b]>d[l]){vc.eb(cnt[b]); p[b]=p[l]; b=p[sp[b][0]];}
        svec(vc);
        for(auto j:vc){
            if(!ans[j])ans[j]=++num;
        }
        ans[i]=++num;
    }
    for(int i=1; i<=m; i++)printf("%d ", ans[i]);
}

Compilation message

riggedroads.cpp: In function 'int main()':
riggedroads.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
riggedroads.cpp:48:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1; i<=m; i++)scanf("%d %d", &edge[i].F, &edge[i].S);
                            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
riggedroads.cpp:51:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a);
         ~~~~~^~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7424 KB Output is correct
2 Correct 10 ms 7424 KB Output is correct
3 Correct 9 ms 7424 KB Output is correct

Subtask #2
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7424 KB Output is correct
2 Correct 10 ms 7424 KB Output is correct
3 Correct 9 ms 7424 KB Output is correct
4 Correct 9 ms 7552 KB Output is correct
5 Correct 11 ms 7552 KB Output is correct
6 Correct 10 ms 7552 KB Output is correct
7 Correct 11 ms 7552 KB Output is correct
8 Correct 10 ms 7552 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 90 ms 25456 KB Output is correct
2 Correct 163 ms 31984 KB Output is correct
3 Correct 149 ms 15992 KB Output is correct
4 Correct 234 ms 57316 KB Output is correct
5 Correct 258 ms 59620 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 164 ms 31900 KB Output is correct
2 Correct 109 ms 18680 KB Output is correct
3 Correct 58 ms 13300 KB Output is correct
4 Correct 136 ms 27156 KB Output is correct
5 Correct 42 ms 15480 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 378 ms 57456 KB Output is correct
2 Correct 381 ms 63796 KB Output is correct
3 Correct 83 ms 23444 KB Output is correct
4 Correct 132 ms 31504 KB Output is correct
5 Correct 429 ms 69176 KB Output is correct

Subtask #6
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 264 ms 41180 KB Output is correct
2 Correct 156 ms 32760 KB Output is correct
3 Correct 504 ms 66296 KB Output is correct
4 Correct 436 ms 62072 KB Output is correct
5 Correct 32 ms 12664 KB Output is correct

Subtask #7
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7424 KB Output is correct
2 Correct 10 ms 7424 KB Output is correct
3 Correct 9 ms 7424 KB Output is correct
4 Correct 9 ms 7552 KB Output is correct
5 Correct 11 ms 7552 KB Output is correct
6 Correct 10 ms 7552 KB Output is correct
7 Correct 11 ms 7552 KB Output is correct
8 Correct 10 ms 7552 KB Output is correct
9 Correct 90 ms 25456 KB Output is correct
10 Correct 163 ms 31984 KB Output is correct
11 Correct 149 ms 15992 KB Output is correct
12 Correct 234 ms 57316 KB Output is correct
13 Correct 258 ms 59620 KB Output is correct
14 Correct 164 ms 31900 KB Output is correct
15 Correct 109 ms 18680 KB Output is correct
16 Correct 58 ms 13300 KB Output is correct
17 Correct 136 ms 27156 KB Output is correct
18 Correct 42 ms 15480 KB Output is correct
19 Correct 378 ms 57456 KB Output is correct
20 Correct 381 ms 63796 KB Output is correct
21 Correct 83 ms 23444 KB Output is correct
22 Correct 132 ms 31504 KB Output is correct
23 Correct 429 ms 69176 KB Output is correct
24 Correct 264 ms 41180 KB Output is correct
25 Correct 156 ms 32760 KB Output is correct
26 Correct 504 ms 66296 KB Output is correct
27 Correct 436 ms 62072 KB Output is correct
28 Correct 32 ms 12664 KB Output is correct
29 Correct 563 ms 59740 KB Output is correct
30 Correct 539 ms 63040 KB Output is correct
31 Correct 485 ms 63024 KB Output is correct
32 Correct 176 ms 18808 KB Output is correct
33 Correct 500 ms 63352 KB Output is correct