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Submission #295336

# Submission time Handle Problem Language Result Execution time Memory
295336 2020-09-09T15:39:13 Z beso123 Rigged Roads (NOI19_riggedroads) C++14
100 / 100
 1274 ms 85720 KB 
#include <bits/stdc++.h>
#define pii pair<int,int>
#define x first
#define y second
using namespace std;
const int N=300005;
int n,timer=1,lg=20,tin[N],p[N],m,t=1,ans[N],yes[N],tout[N],used[N];
vector<pii> ed;
vector<int> g[N],dp[N];
int nom[N];
void DFS(int v,int p){
    used[v]=1;
    dp[v][0]=p;
    for(int k=1;k<=19;k++)
        dp[v][k]=dp[dp[v][k-1]][k-1];
        tin[v]=timer++;
    for(int k=0;k<g[v].size();k++){
        int to=g[v][k];
        if(used[to]==0)
            DFS(to,v);
    }
    tout[v]=timer++;
}
bool tree(int a,int b){
    if(tin[a]<=tin[b] && tout[a]>=tout[b])
        return true;
     return false;
}
int LCA(int a,int b){
    if(tree(a,b)) return a;
    if(tree(b,a)) return b;
    int t=a;
    for(int k=19;k>=0;k--){
        if(dp[t][k]!=0){
        int to=dp[t][k];
        if(!tree(to,b))
            t=to;
    }
}
    return dp[t][0];
}
int FS(int v){
    if(v==p[v]) return v;
    return p[v]=FS(p[v]);
}
void US(int a,int b){
    a=FS(a);
    b=FS(b);
    if(a!=b){
        if(tree(b,a))
           swap(a,b);
        p[b]=a;
    }
    a=FS(a);
    b=FS(b);
}
main(){
cin>>n>>m;
for(int k=1;k<=m;k++){
    int a,b;
    cin>>a>>b;
    ed.push_back({a,b});
}
vector<int> op;
for(int k=1;k<n;k++){
    int a;
   cin>>a;
    a--;
    op.push_back(a);
    yes[a]=1;
    g[ed[a].x].push_back(ed[a].y);
    g[ed[a].y].push_back(ed[a].x);
}
for(int k=0;k<=n;k++){
    dp[k].resize(lg+1,0);
    p[k]=k;
}
    DFS(1,0);
for(int k=0;k<op.size();k++){
    int a=ed[op[k]].x,b=ed[op[k]].y;
    if(tree(b,a))
        swap(a,b);
    nom[b]=op[k];
}

for(int k=0;k<m;k++){
   if(ans[k]==0){
   if(yes[k]){
    US(ed[k].x,ed[k].y);
    ans[k]=t;
   }
   else{
    int a=ed[k].x,b=ed[k].y;
    int lc=LCA(a,b);
   set<int> v;
    while(FS(lc)!=FS(b) || FS(lc)!=FS(a)){
      if(FS(lc)!=FS(a)){
          int lo=nom[a];
          if(!ans[lo])
        v.insert(lo);
        US(a,dp[a][0]);
        a=FS(a);
       }
    if(FS(lc)!=FS(b)){
        int lo=nom[b];
        if(!ans[lo])
        v.insert(lo);
        US(b,dp[b][0]);
        b=FS(b);
       }
    }
 for(auto i : v){
    ans[i]=t;
    t++;
     }
 ans[k]=t;
   }
   t++;
   }
   cout<<ans[k]<<' ';
}
return 0;
}

Compilation message

riggedroads.cpp: In function 'void DFS(int, int)':
riggedroads.cpp:14:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   14 |     for(int k=1;k<=19;k++)
      |     ^~~
riggedroads.cpp:16:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   16 |         tin[v]=timer++;
      |         ^~~
riggedroads.cpp:17:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for(int k=0;k<g[v].size();k++){
      |                 ~^~~~~~~~~~~~
riggedroads.cpp: At global scope:
riggedroads.cpp:57:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   57 | main(){
      |      ^
riggedroads.cpp: In function 'int main()':
riggedroads.cpp:79:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 | for(int k=0;k<op.size();k++){
      |             ~^~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 14592 KB Output is correct
2 Correct 10 ms 14464 KB Output is correct
3 Correct 11 ms 14464 KB Output is correct

Subtask #2
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 14592 KB Output is correct
2 Correct 10 ms 14464 KB Output is correct
3 Correct 11 ms 14464 KB Output is correct
4 Correct 12 ms 14592 KB Output is correct
5 Correct 12 ms 14592 KB Output is correct
6 Correct 13 ms 14592 KB Output is correct
7 Correct 11 ms 14592 KB Output is correct
8 Correct 12 ms 14592 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 211 ms 33192 KB Output is correct
2 Correct 401 ms 40756 KB Output is correct
3 Correct 400 ms 26800 KB Output is correct
4 Correct 592 ms 66012 KB Output is correct
5 Correct 624 ms 68572 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 360 ms 42840 KB Output is correct
2 Correct 215 ms 26220 KB Output is correct
3 Correct 113 ms 20592 KB Output is correct
4 Correct 265 ms 35528 KB Output is correct
5 Correct 112 ms 22880 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 769 ms 73480 KB Output is correct
2 Correct 1006 ms 82892 KB Output is correct
3 Correct 257 ms 33632 KB Output is correct
4 Correct 356 ms 40864 KB Output is correct
5 Correct 995 ms 85720 KB Output is correct

Subtask #6
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 785 ms 52864 KB Output is correct
2 Correct 409 ms 39400 KB Output is correct
3 Correct 1159 ms 70928 KB Output is correct
4 Correct 1089 ms 67056 KB Output is correct
5 Correct 73 ms 19444 KB Output is correct

Subtask #7
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 14592 KB Output is correct
2 Correct 10 ms 14464 KB Output is correct
3 Correct 11 ms 14464 KB Output is correct
4 Correct 12 ms 14592 KB Output is correct
5 Correct 12 ms 14592 KB Output is correct
6 Correct 13 ms 14592 KB Output is correct
7 Correct 11 ms 14592 KB Output is correct
8 Correct 12 ms 14592 KB Output is correct
9 Correct 211 ms 33192 KB Output is correct
10 Correct 401 ms 40756 KB Output is correct
11 Correct 400 ms 26800 KB Output is correct
12 Correct 592 ms 66012 KB Output is correct
13 Correct 624 ms 68572 KB Output is correct
14 Correct 360 ms 42840 KB Output is correct
15 Correct 215 ms 26220 KB Output is correct
16 Correct 113 ms 20592 KB Output is correct
17 Correct 265 ms 35528 KB Output is correct
18 Correct 112 ms 22880 KB Output is correct
19 Correct 769 ms 73480 KB Output is correct
20 Correct 1006 ms 82892 KB Output is correct
21 Correct 257 ms 33632 KB Output is correct
22 Correct 356 ms 40864 KB Output is correct
23 Correct 995 ms 85720 KB Output is correct
24 Correct 785 ms 52864 KB Output is correct
25 Correct 409 ms 39400 KB Output is correct
26 Correct 1159 ms 70928 KB Output is correct
27 Correct 1089 ms 67056 KB Output is correct
28 Correct 73 ms 19444 KB Output is correct
29 Correct 1238 ms 66836 KB Output is correct
30 Correct 1274 ms 72760 KB Output is correct
31 Correct 1080 ms 69212 KB Output is correct
32 Correct 365 ms 26740 KB Output is correct
33 Correct 1047 ms 69404 KB Output is correct