Submission #889247

#	Time	Username	Problem	Language	Result	Execution time	Memory
889247		alexander707070	Dango Maker (JOI18_dango_maker)	C++14	0 / 100	60 ms	262144 KiB

dango_maker

#include<bits/stdc++.h>
#define MAXN 20000007
using namespace std;

int n,m;
char t[3007][3007];

vector<int> v[MAXN];
int li[MAXN];

bool dfs(int x,int p){
    li[x]=1;

    for(int i=0;i<v[x].size();i++){
        if(v[x][i]==p)continue;
        if(li[v[x][i]]==0 and dfs(v[x][i],x))return true;
        if(li[v[x][i]]==1)return true;
    }

    li[x]=2;
    return false;
}

int main(){

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>m;

    for(int i=1;i<=n;i++){
        for(int f=1;f<=m;f++){
            cin>>t[i][f];
        }
    }

    for(int i=1;i<=n-2;i++){
        for(int f=1;f<=m-2;f++){
            if(t[i][f]=='R' and t[i][f+1]=='G' and t[i][f+2]=='W' and t[i+1][f]=='G' and t[i+2][f]=='W'){
                v[i*m+f].push_back(i*m+f+n*m);
                v[i*m+f+n*m].push_back(i*m+f);
            }
        }
    }

    for(int i=2;i<=n-1;i++){
        for(int f=2;f<=m-1;f++){
            if(t[i][f]=='G' and t[i][f-1]=='R' and t[i][f+1]=='W' and t[i-1][f]=='R' and t[i+1][f]=='W'){
                v[i*m+f-1].push_back((i-1)*m+f+n*m);
                v[(i-1)*m+f+n*m].push_back(i*m+f-1);
            }
        }
    }

    for(int i=3;i<=n;i++){
        for(int f=3;f<=m;f++){
            if(t[i][f]=='W' and t[i][f-2]=='R' and t[i][f-1]=='G' and t[i-2][f]=='R' and t[i-1][f]=='G'){
                v[i*m+f-2].push_back((i-2)*m+f+n*m);
                v[(i-2)*m+f+n*m].push_back(i*m+f-2);
            }
        }
    }

    for(int i=1;i<=3*n*m;i++){
        if(li[i]==0){
            if(dfs(i,0))cout<<1/0;
        }
    }

    cout<<"OK\n";

    return 0;
}

Compilation message (stderr)

dango_maker.cpp: In function 'bool dfs(int, int)':
dango_maker.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
dango_maker.cpp: In function 'int main()':
dango_maker.cpp:67:32: warning: division by zero [-Wdiv-by-zero]
   67 |             if(dfs(i,0))cout<<1/0;
      |                               ~^~

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