제출 #824045

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
824045		Amylopectin	Stranded Far From Home (BOI22_island)	C++14	100 / 100	199 ms	79072 KiB

island

#include <stdio.h>
#include <iostream>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;
const long long mxn = 1e6 + 10;
struct we
{
    long long idx,val;
};
bool cmp(const struct we &l,const struct we &r)
{
    return l.val < r.val;
}
struct we sot[mxn] = {};
char ans[mxn] = {};
long long npop[mxn] = {},gr[mxn] = {},he[mxn] = {},siz[mxn] = {},u[mxn] = {};
vector<long long> pat[mxn] = {},tre[mxn] = {};
long long figr(long long l)
{
    long long cl = l,f;
    while(l != gr[l])
    {
        l = gr[l];
    }
    while(cl != gr[cl])
    {
        f = gr[cl];
        gr[cl] = l;
        cl = f;
    }
    return l;
}
long long mer(long long cl,long long cr)
{
    long long l = figr(cl),r = figr(cr);
    gr[r] = l;
    siz[l] += siz[r];
    return l;
}
long long re(long long cn)
{
    long long i,j,fn;
    ans[cn] = '1';
    for(i=0; i<tre[cn].size(); i++)
    {
        fn = tre[cn][i];
        re(fn);
    }
    return 0;
}
int main()
{
    long long i,j,n,m,cn,cm,fn,fm;
    scanf("%lld %lld",&n,&m);
    for(i=0; i<n; i++)
    {
        scanf("%lld",&npop[i]);
        sot[i] = {i,npop[i]};
        he[i] = i;
        gr[i] = i;
        siz[i] = npop[i];
        ans[i] = '0';
    }
    for(i=0; i<m; i++)
    {
        scanf("%lld %lld",&cn,&cm);
        pat[cn-1].push_back(cm-1);
        pat[cm-1].push_back(cn-1);
    }
    sort(sot,sot+n,cmp);
    for(i=0; i<n; i++)
    {
        cn = sot[i].idx;
        u[cn] = 1;
        for(j=0; j<pat[cn].size(); j++)
        {
            fn = pat[cn][j];
            if(u[fn] == 0)
            {
                continue;
            }
            cm = figr(cn);
            fm = figr(fn);
            if(cm != fm)
            {
                if(siz[fm] >= npop[cn])
                {
                    tre[cn].push_back(he[fm]);
                }
                mer(cm,fm);
            }
        }
    }
    re(sot[n-1].idx);
    printf("%s\n",ans);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

island.cpp: In function 'long long int re(long long int)':
island.cpp:46:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for(i=0; i<tre[cn].size(); i++)
      |              ~^~~~~~~~~~~~~~~
island.cpp:44:17: warning: unused variable 'j' [-Wunused-variable]
   44 |     long long i,j,fn;
      |                 ^
island.cpp: In function 'int main()':
island.cpp:77:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |         for(j=0; j<pat[cn].size(); j++)
      |                  ~^~~~~~~~~~~~~~~
island.cpp:56:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |     scanf("%lld %lld",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
island.cpp:59:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         scanf("%lld",&npop[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~
island.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         scanf("%lld %lld",&cn,&cm);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~

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