Submission #1085755

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085755		alexander707070	Game (APIO22_game)	C++17	60 / 100	4083 ms	49412 KiB

game

#include<bits/stdc++.h>

#define MAXN 300007
using namespace std;

const int bucket_sz=1000;

int n,k,bucket[MAXN];
int from[MAXN],to[MAXN];
int mins[MAXN],maxs[MAXN];

int li[MAXN],tim,cnt[MAXN];

vector<int> v[MAXN],r[MAXN],news;

void init(int N,int K){
    n=N; k=K;

    for(int i=1;i<=k;i++){
        bucket[i]=i/bucket_sz+1;
    }

    for(int i=1;i<=k;i++){
        mins[i]=maxs[i]=bucket[i];
        from[i]=to[i]=i;
    }

    for(int i=k+1;i<=n;i++){
        from[i]=n+1; to[i]=0;
        mins[i]=800; maxs[i]=0;
    }
}

int dfs(int x,int val,int val2){
    li[x]=tim;

    if(maxs[x]>val)return 0;
    if(maxs[x]==val and (mins[x]!=maxs[x] or to[x]>=val2))return 0;

    if(mins[x]==maxs[x]){
        to[x]=val2;
        if(from[x]<=to[x] or mins[x]<val){
            if(from[x]<to[x] or x>k)return 1;
        }
    }else{
        maxs[x]=val;

        if(mins[x]<maxs[x])return 1;
        if(mins[x]==maxs[x])news.push_back(x);
    }

    //cnt[x]++;
    //if(cnt[x]>1500)cout<<1/0;

    for(int i=0;i<v[x].size();i++){
        if(li[v[x][i]]==tim)continue;

        if(dfs(v[x][i],val,val2)==1)return 1;
    }

    return 0;
}

int dfs2(int x,int val,int val2){
    li[x]=tim;

    if(mins[x]<val)return 0;
    if(mins[x]==val and (mins[x]!=maxs[x] or from[x]<=val2))return 0;

    if(mins[x]==maxs[x]){
        from[x]=val2;
        if(from[x]<=to[x] or val<maxs[x]){
            if(from[x]<to[x] or x>k)return 1;
        }
    }else{
        mins[x]=val;
        if(mins[x]<maxs[x])return 1;

        if(mins[x]==maxs[x])news.push_back(x);
    }

    //cnt[x]++;
    //if(cnt[x]>1500)cout<<1/0;

    for(int i=0;i<r[x].size();i++){
        if(li[r[x][i]]==tim)continue;

        if(dfs2(r[x][i],val,val2)==1)return 1;
    }

    return 0;
}

void dfs3(int x){
    li[x]=tim;

    if(from[x]!=n+1)return;

    //cnt[x]++;
    //if(cnt[x]>1500)cout<<1/0;

    for(int i=0;i<v[x].size();i++){
        if(li[v[x][i]]==tim)continue;

        dfs3(v[x][i]);
        from[x]=min(from[x],from[v[x][i]]);
    }
}

int dfs4(int x){
    li[x]=tim;

    if(to[x]!=0)return 0;

    //cnt[x]++;
    //if(cnt[x]>1500)cout<<1/0;

    int z=0;
    for(int i=0;i<r[x].size();i++){
        if(li[r[x][i]]==tim)continue;

        z=dfs4(r[x][i]);
        to[x]=max(to[x],to[r[x][i]]);
        if(z==1)return 1;
    }

    if(from[x]<=to[x])return 1;
    return 0;
}

int add_teleporter(int a, int b){
    a++; b++;

    if(a==b){
        if(a<=k)return 1;
        return 0;
    }

    news.clear();

    v[a].push_back(b); tim++;
    int z=dfs(b,maxs[a],to[a]);

    if(z==1)return 1;

    r[b].push_back(a); tim++;
    z=dfs2(a,mins[b],from[b]);

    if(z==1)return 1;

    tim++;
    for(int i:news){
        if(li[i]!=tim)dfs3(i);   
    }

    tim++;
    for(int i:news){
        if(li[i]!=tim){
            if(dfs4(i)==1)return 1;
        }   
    }

    return 0;
}

/*int main(){

    init(6, 3);

    cout<<add_teleporter(3, 4);
    cout<<add_teleporter(5, 0);
    cout<<add_teleporter(4, 5);
    cout<<add_teleporter(5, 3);
    cout<<add_teleporter(1, 4);

    return 0;
}*/

Compilation message (stderr)

game.cpp: In function 'int dfs(int, int, int)':
game.cpp:55:18: 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<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
game.cpp: In function 'int dfs2(int, int, int)':
game.cpp:85:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |     for(int i=0;i<r[x].size();i++){
      |                 ~^~~~~~~~~~~~
game.cpp: In function 'void dfs3(int)':
game.cpp:102:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
game.cpp: In function 'int dfs4(int)':
game.cpp:119:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  119 |     for(int i=0;i<r[x].size();i++){
      |                 ~^~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 30 / 30
• Subtask 5: 0 / 40