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struct DSU {
    int par[N] ;
    void init(int u) {
        par[u] = u ;
    }
    int find(int u) {
        return u == par[u] ? u : par[u] = find(par[u]) ;
    }
    void merge(int u , int v) {
        u = find(u) , v = find(v) ;
        if (u == v) return ;
        par[v] = u ;
    }
} dsu ;

Main.java:1: error: class, interface, or enum expected
struct DSU {
^
Main.java:3: error: class, interface, or enum expected
    void init(int u) {
    ^
Main.java:5: error: class, interface, or enum expected
    }
    ^
Main.java:8: error: class, interface, or enum expected
    }
    ^
Main.java:11: error: class, interface, or enum expected
        if (u == v) return ;
        ^
Main.java:12: error: class, interface, or enum expected
        par[v] = u ;
        ^
Main.java:13: error: class, interface, or enum expected
    }
    ^
7 errors

Standard output is empty