Submission #240888

#	Time	Username	Problem	Language	Result	Execution time	Memory
240888		aggu_01000101	Dango Maker (JOI18_dango_maker)	C++14	0 / 100	133 ms	262144 KiB

dango_maker

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define INF 100000000000000000
//#define int long long
#define lchild(i) (i*2 + 1)
#define rchild(i) (i*2 + 2)
#define mid(l, u) ((l+u)/2)
#define x(p) p.first
#define y(p) p.second
#define MOD 998244353
#define ordered_set tree<pair<int, int>, null_type,less<pair<int, int>>, rb_tree_tag,tree_order_statistics_node_update>
using namespace std;
int n, m;
const int N = 3000;
char mat[N][N];
pair<int, int> nodenum[N][N]; //first->horizontal, second -> vertical
bool vis[2*N*N];
set<int> adj[2*N*N];
int currnode = 0;
int solve(int i){
    vector<int> lvls;
    queue<pair<int, int>> q;
    q.push({i, 0});
    vis[i] = true;
    while(!q.empty()){
        pair<int, int> curr = q.front();
        q.pop();
        if(lvls.size()<=curr.second) lvls.push_back(1);
        else lvls[curr.second]++;
        for(int j: adj[curr.first]){
            if(vis[j]) continue;
            vis[j] = true;
            q.push({j, curr.second + 1});
        }
    }
    int tr = 1;
    vector<int> dp = {lvls[0]};
    if(lvls.size()>=2) dp.push_back(lvls[1]);
    for(int i = 2;i<lvls.size();i++){
        dp.push_back(max(dp[i-1], lvls[i] + dp[i-2]));
    }
    for(int i = 0;i<lvls.size();i++){
        tr = max(tr, dp[i]);
    }
    return tr;
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>m;
    for(int i = 0;i<n;i++){
        string s;
        for(int j = 0;j<m;j++) cin>>mat[i][j];
    }
    for(int i = 0;i<n;i++){
        for(int j = 0;j<m;j++) nodenum[i][j] = {-1, -1};
    }
    for(int i = 0;i<n;i++){
        for(int j = 0;j<m;j++){
            if(mat[i][j]!='R') continue;
            if(i+2<n){
                if(mat[i+1][j]=='G' && mat[i+2][j]=='W'){
                    int cnode = currnode++;
                    //cout<<cnode<<" is ("<<i<<", "<<j<<") vertical"<<endl;
                    nodenum[i][j].second = cnode;
                    if(nodenum[i][j].first != -1){
                        adj[nodenum[i][j].first].insert(cnode);
                        adj[cnode].insert(nodenum[i][j].first);
                    }
                    if(j>0 && nodenum[i+1][j-1].first!=-1){
                        adj[nodenum[i+1][j-1].first].insert(cnode);
                        adj[cnode].insert(nodenum[i+1][j-1].first);
                    }
                    if(j>1 && nodenum[i+2][j-2].first!=-1){
                        adj[nodenum[i+2][j-2].first].insert(cnode);
                        adj[cnode].insert(nodenum[i+2][j-2].first);
                    }
                }
            }
            if(j+2<m){
                if(mat[i][j+1]=='G' && mat[i][j+2]=='W'){
                    int cnode = currnode++;
                    //cout<<cnode<<" is ("<<i<<", "<<j<<") horizontal"<<endl;
                    nodenum[i][j].first = cnode;
                    if(nodenum[i][j].second != -1){
                        adj[nodenum[i][j].second].insert(cnode);
                        adj[cnode].insert(nodenum[i][j].second);
                    }
                    if(i>0 && nodenum[i-1][j+1].second!=-1){
                        adj[nodenum[i-1][j+1].second].insert(cnode);
                        adj[cnode].insert(nodenum[i-1][j+1].second);
                    }
                    if(i>1 && nodenum[i-2][j+2].second!=-1){
                        adj[nodenum[i-2][j+2].second].insert(cnode);
                        adj[cnode].insert(nodenum[i-2][j+2].second);
                    }
                }
            }
        }
    }
    int ans = 0;
    for(int i = 0;i<currnode;i++){
        /*cout<<i<<" is connected to: ";
        for(int j: adj[i]){
            cout<<j<<" ";
        }
        cout<<endl;
         */
        if(!vis[i]){
            ans+=solve(i);
        }
    }
    cout<<ans<<endl;
    //create a node out of each skewer that you can make
    //connect nodes that intersect with each other
    //For each connected component,
}
/*
4 4
RGWR
GRRG
WGGW
WWWR

5 5
RGRGW
GRRGW
WGGWR
RWRGW
RGWGW
 */

Compilation message (stderr)

dango_maker.cpp: In function 'int solve(int)':
dango_maker.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(lvls.size()<=curr.second) lvls.push_back(1);
            ~~~~~~~~~~~^~~~~~~~~~~~~
dango_maker.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 2;i<lvls.size();i++){
                   ~^~~~~~~~~~~~
dango_maker.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0;i<lvls.size();i++){
                   ~^~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67