Submission #605576

#	Time	Username	Problem	Language	Result	Execution time	Memory
605576		duality	Stranded Far From Home (BOI22_island)	C++17	100 / 100	235 ms	36504 KiB

island

#define DEBUG 0

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

#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}

// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
    public:
        template<typename T>
        _Debug& operator,(T val) {
            cout << val << endl;
            return *this;
        }
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif

// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back

// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;

// ---------- END OF TEMPLATE ----------

int s[200000];
vi adjList[200000];
vi S[200000];
int order[200000],parent[200000];
int find(int n) {
    if (parent[n] != n) parent[n] = find(parent[n]);
    return parent[n];
}
int seen[200000],ans[200000];
LLI ss[200000];
int main() {
    int i;
    int N,M;
    int u,v;
    scanf("%d %d",&N,&M);
    for (i = 0; i < N; i++) scanf("%d",&s[i]);
    for (i = 0; i < M; i++) {
        scanf("%d %d",&u,&v);
        u--,v--;
        adjList[u].pb(v);
        adjList[v].pb(u);
    }

    for (i = 0; i < N; i++) parent[i] = order[i] = i,S[i].pb(i),ss[i] = s[i];
    sort(order,order+N,[&](int a,int b) { return s[a] < s[b]; });
    for (i = 0; i < N; i++) {
        int u = order[i];
        seen[u] = 1;
        for (int v: adjList[u]) {
            if (seen[v]) {
                if (find(u) != find(v)) {
                    int uu = find(u),vv = find(v);
                    if (ss[vv] < s[u]) S[vv].clear();
                    if (S[uu].size() > S[vv].size()) swap(uu,vv);
                    for (int x: S[uu]) S[vv].pb(x);
                    S[uu].clear(),parent[uu] = vv,ss[vv] += ss[uu];
                }
            }
        }
    }
    for (int x: S[find(0)]) ans[x] = 1;
    for (i = 0; i < N; i++) printf("%d",ans[i]);
    printf("\n");

    return 0;
}

Compilation message (stderr)

island.cpp: In function 'int main()':
island.cpp:72:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     scanf("%d %d",&N,&M);
      |     ~~~~~^~~~~~~~~~~~~~~
island.cpp:73:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |     for (i = 0; i < N; i++) scanf("%d",&s[i]);
      |                             ~~~~~^~~~~~~~~~~~
island.cpp:75:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         scanf("%d %d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 30 / 30
• Subtask 5: 35 / 35