oj.uz

Submission #153416

# Submission time Handle Problem Language Result Execution time Memory
153416 2019-09-14T07:03:18 Z mhy908 Dango Maker (JOI18_dango_maker) C++14
13 / 100
 74 ms 71032 KB 
#include <bits/stdc++.h>
#define pb push_back
#define INF 987654321
using namespace std;
typedef long long LL;
int n, m, x;
char str[3010][3010];
int col[3010][3010][3], re[3010][3010], ans;
vector<int> link[3000010], id;
int par[3000010];
bool used[3000010];
int dist[3000010], A[3000010], B[3000010];
vector<vector<int> > vc;
int findpar(int num)
{
    if(num==par[num])return num;
    return par[num]=findpar(par[num]);
}
void mergepar(int a, int b)
{
    a=findpar(a);
    b=findpar(b);
    par[a]=par[b];
}
void bfs(int p)
{
    queue<int> Q;
    for(int i=0; i<vc[p].size(); i++){
        if(!used[vc[p][i]]){
            dist[vc[p][i]]=0;
            Q.push(vc[p][i]);
        }
        else dist[vc[p][i]]=INF;
    }
    while(!Q.empty()){
        int a=Q.front();
        Q.pop();
        for(int b: link[a]){
            if(B[b]!=-1&&dist[B[b]]==INF){
                dist[B[b]]=dist[a]+1;
                Q.push(B[b]);
            }
        }
    }
}
bool dfs(int a){
    for(int b: link[a]){
        if(B[b]==-1||dist[B[b]]==dist[a]+1&&dfs(B[b])){
            used[a]=true;
            A[a]=b;
            B[b]=a;
            return true;
        }
    }
    return false;
}
int hopcroft_carp(int p)
{
    int match=0;
    while(1){
        bfs(p);
        int flow = 0;
        for(int i=0; i<vc[p].size(); i++)
            if(!used[vc[p][i]] && dfs(vc[p][i])) flow++;
        if(!flow)break;
        match+=flow;
    }
    return match/2;
}
int main()
{
    scanf("%d%d", &n, &m);
    for(int i=1; i<=n; i++){
        scanf("%s", str[i]+1);
    }
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            if(str[i][j]=='R'&&str[i][j+1]=='G'&&str[i][j+2]=='W'){
                ++x;
                col[i][j][++re[i][j]]=x;
                col[i][j+1][++re[i][j+1]]=x;
                col[i][j+2][++re[i][j+2]]=x;
            }
            if(str[i][j]=='R'&&str[i+1][j]=='G'&&str[i+2][j]=='W'){
                ++x;
                col[i][j][++re[i][j]]=x;
                col[i+1][j][++re[i+1][j]]=x;
                col[i+2][j][++re[i+2][j]]=x;
            }
        }
    }
    for(int i=1; i<=x; i++)par[i]=i;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            if(re[i][j]==2){
                mergepar(col[i][j][1], col[i][j][2]);
                link[col[i][j][1]].pb(col[i][j][2]);
                link[col[i][j][2]].pb(col[i][j][1]);
            }
        }
    }
    for(int i=1; i<=x; i++){
        id.pb(findpar(i));
    }
    sort(id.begin(), id.end());
    id.erase(unique(id.begin(), id.end()), id.end());
    int maxpar=1;
    for(int i=1; i<=x; i++){
        par[i]=lower_bound(id.begin(), id.end(), par[i])-id.begin();
        maxpar=max(maxpar, par[i]+1);
    }
    vc.resize(maxpar);
    for(int i=1; i<=x; i++){
        vc[par[i]].pb(i);
    }
    fill(A+1, A+x+1, -1);
    fill(B+1, B+x+1, -1);
    for(int i=0; i<maxpar; i++){
        if(vc[i].size()==1)ans++;
        else ans+=hopcroft_carp(i);
    }
    printf("%d", ans);
}

Compilation message

dango_maker.cpp: In function 'void bfs(int)':
dango_maker.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<vc[p].size(); i++){
                  ~^~~~~~~~~~~~~
dango_maker.cpp: In function 'bool dfs(int)':
dango_maker.cpp:48:43: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(B[b]==-1||dist[B[b]]==dist[a]+1&&dfs(B[b])){
                      ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
dango_maker.cpp: In function 'int hopcroft_carp(int)':
dango_maker.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0; i<vc[p].size(); i++)
                      ~^~~~~~~~~~~~~
dango_maker.cpp: In function 'int main()':
dango_maker.cpp:72:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
dango_maker.cpp:74:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s", str[i]+1);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 70776 KB Output is correct
2 Correct 74 ms 70760 KB Output is correct
3 Correct 66 ms 70776 KB Output is correct
4 Correct 65 ms 70776 KB Output is correct
5 Correct 65 ms 70804 KB Output is correct
6 Correct 65 ms 71032 KB Output is correct
7 Correct 65 ms 70780 KB Output is correct
8 Correct 66 ms 70876 KB Output is correct
9 Correct 65 ms 70820 KB Output is correct
10 Correct 65 ms 70904 KB Output is correct
11 Correct 66 ms 70876 KB Output is correct
12 Correct 66 ms 70812 KB Output is correct
13 Correct 66 ms 70800 KB Output is correct
14 Correct 65 ms 70848 KB Output is correct
15 Correct 65 ms 70776 KB Output is correct
16 Correct 66 ms 70952 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 70776 KB Output is correct
2 Correct 74 ms 70760 KB Output is correct
3 Correct 66 ms 70776 KB Output is correct
4 Correct 65 ms 70776 KB Output is correct
5 Correct 65 ms 70804 KB Output is correct
6 Correct 65 ms 71032 KB Output is correct
7 Correct 65 ms 70780 KB Output is correct
8 Correct 66 ms 70876 KB Output is correct
9 Correct 65 ms 70820 KB Output is correct
10 Correct 65 ms 70904 KB Output is correct
11 Correct 66 ms 70876 KB Output is correct
12 Correct 66 ms 70812 KB Output is correct
13 Correct 66 ms 70800 KB Output is correct
14 Correct 65 ms 70848 KB Output is correct
15 Correct 65 ms 70776 KB Output is correct
16 Correct 66 ms 70952 KB Output is correct
17 Correct 65 ms 70844 KB Output is correct
18 Correct 65 ms 70912 KB Output is correct
19 Incorrect 66 ms 70904 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 67.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 70776 KB Output is correct
2 Correct 74 ms 70760 KB Output is correct
3 Correct 66 ms 70776 KB Output is correct
4 Correct 65 ms 70776 KB Output is correct
5 Correct 65 ms 70804 KB Output is correct
6 Correct 65 ms 71032 KB Output is correct
7 Correct 65 ms 70780 KB Output is correct
8 Correct 66 ms 70876 KB Output is correct
9 Correct 65 ms 70820 KB Output is correct
10 Correct 65 ms 70904 KB Output is correct
11 Correct 66 ms 70876 KB Output is correct
12 Correct 66 ms 70812 KB Output is correct
13 Correct 66 ms 70800 KB Output is correct
14 Correct 65 ms 70848 KB Output is correct
15 Correct 65 ms 70776 KB Output is correct
16 Correct 66 ms 70952 KB Output is correct
17 Correct 65 ms 70844 KB Output is correct
18 Correct 65 ms 70912 KB Output is correct
19 Incorrect 66 ms 70904 KB Output isn't correct
20 Halted 0 ms 0 KB -