Submission #64983

#	Time	Username	Problem	Language	Result	Execution time	Memory
64983		patrikpavic2	Dango Maker (JOI18_dango_maker)	C++17	33 / 100	62 ms	38004 KiB

dango_maker

#include <cstdio>
#include <cstring>
#include <vector>

using namespace std;

const int N = 1e3 + 50;
const int M = N * N / 3;

vector < int > v[M], k[N][N];

int ty[M], sl[M], bio[M], mat[M];
char s[N][N];
int n, m, edg, cnt = 1;

int dfs( int node ) {
    if( bio[ node ] ) return 0;
    bio[ node ] = 1;
    for(int sus : v[node]){
        if( mat[ sus ] == -1 || dfs( mat[ sus ]) ) {
            mat[ sus ] = node;
            return 1;
        }
    }
    return 0;
}

int matching( ) {
    int sol = 0;
    memset( mat, -1, sizeof( mat ) );
    for( int i = 1; i < cnt; i++) {
        if(ty[i]) continue;
        sol += dfs(i);

    }
    return sol;
}


int main(){
    memset(s, '.', sizeof(s));
    scanf("%d%d", &n, &m);
    for(int i = 1;i<=n;i++){
        for(int j = 1;j<=m;j++){
            scanf(" %c", &s[i][j]);
        }
    }
    for(int i = 1;i<=n;i++){
        for(int j = 1;j<=m;j++){
            if(s[i][j] != 'G') continue;
            if(s[i - 1][j] == 'R' && s[i + 1][j] == 'W'){
                k[i - 1][j].push_back(cnt);
                k[i + 1][j].push_back(cnt);
                k[i][j].push_back(cnt);
                cnt++;
            }
            if(s[i][j - 1] == 'R' && s[i][j + 1] == 'W'){
                k[i][j - 1].push_back(cnt);
                k[i][j + 1].push_back(cnt);
                k[i][j].push_back(cnt);
                ty[cnt] = 1;
                cnt++;
            }
        }
    }
    for(int i = 1;i<=n;i++){
        for(int j = 1;j<=m;j++){
            if(k[i][j].size() == 2){
                v[k[i][j][0]].push_back(k[i][j][1]);
                v[k[i][j][1]].push_back(k[i][j][0]);
            }
        }
    }
    printf("%d\n", cnt - matching() - 1);
    return 0;
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:42:10: 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:45:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf(" %c", &s[i][j]);
             ~~~~~^~~~~~~~~~~~~~~~~

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