Submission #64997

#	Time	Username	Problem	Language	Result	Execution time	Memory
64997		patrikpavic2	Dango Maker (JOI18_dango_maker)	C++17	13 / 100	3 ms	688 KiB

dango_maker

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

    using namespace std;

    const int N = 105;
    const int M = N * N / 5;

    vector < int > v[M];

    bool bio[M], ty[M];
    int mat[M], kk[N][N][2];
    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;
                int kol = 0;
                if(s[i - 1][j] == 'R' && s[i + 1][j] == 'W'){
                    kk[i][j][0] = cnt;
                    cnt++;kol++;
                }
                if(s[i][j - 1] == 'R' && s[i][j + 1] == 'W'){
                    ty[cnt] = 1;
                    kk[i][j][1] = cnt;
                    cnt++;kol++;
                }
                if(kol == 2){
                    v[cnt - 1].push_back(cnt - 2);
                    v[cnt - 2].push_back(cnt - 1);
                    edg++;
                }
            }
        }
        for(int i = 1;i<=n;i++){
            for(int j = 1;j<=m;j++){
                if(i + 1 < n && j + 1 < m && s[i][j] == 'R' && s[i + 1][j] == 'G' && s[i][j + 1] == 'G' && s[i + 2][j] == 'W' && s[i][j + 2] == 'W'){
                    v[kk[i + 1][j][0]].push_back(kk[i][j + 1][1]);
                    v[kk[i][j + 1][1]].push_back(kk[i + 1][j][0]);
                    //printf("AT %d %d\n", i, j);
                    edg++;
                }
                if(i > 2 && j > 2 && s[i][j] == 'W' && s[i - 1][j] == 'G' && s[i][j - 1] == 'G' && s[i - 2][j] == 'R' && s[i][j - 2] == 'R'){
                    v[kk[i - 1][j][0]].push_back(kk[i][j - 1][1]);
                    v[kk[i][j - 1][1]].push_back(kk[i - 1][j][0]);
                    //printf("AT %d %d\n", i, j);
                    edg++;
                }

            }
        }
        //printf("EDG %d\n", edg);
        printf("%d\n", cnt - matching() - 1);
        return 0;
    }

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:43:14: 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:46:22: 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: 0 / 20
• Subtask 3: 0 / 67