Submission #172297

#	Time	Username	Problem	Language	Result	Execution time	Memory
172297		arnold518	Library (JOI18_library)	C++14	19 / 100	775 ms	4600 KiB

library

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1000;

int N;

int memo[MAXN+10][MAXN+10];
vector<int> adj[MAXN+10];
bool vis[MAXN+10];
vector<int> ans;

int query(int l, int r)
{
    int i, j;

    if(l==r) memo[l][r]=1;
    else if(memo[l][r]==-1)
    {
        vector<int> t;
        t.resize(N);
        for(i=l; i<=r; i++) t[i-1]=1;
        memo[l][r]=Query(t);
    }
    return memo[l][r];
}

void Solve(int _N)
{
    int i, j;
    N=_N;
    memset(memo, -1, sizeof(memo));

    if(N==1)
    {
        Answer(vector<int>(1, 1));
        return;
    }

    for(i=1; i<=N; i++)
    {
        int lo, hi;

        lo=0, hi=i;
        while(lo+1<hi)
        {
            int mid=lo+hi>>1, t;
            if(mid==0) t=2;
            else t=query(mid, i-1)+1-query(mid, i);

            if(t<=0) hi=mid;
            else lo=mid;
        }
        if(lo) adj[i].push_back(lo), adj[lo].push_back(i);

        lo=0, hi=i;
        while(lo+1<hi)
        {
            int mid=lo+hi>>1, t;
            if(mid==0) t=2;
            else t=query(mid, i-1)+1-query(mid, i);

            if(t<=1) hi=mid;
            else lo=mid;
        }
        if(lo) adj[i].push_back(lo), adj[lo].push_back(i);
    }

    int now=0;
    for(i=1; i<=N; i++) if(adj[i].size()==1) break;
    now=i;

    while(1)
    {
        ans.push_back(now); vis[now]=1;
        int cnt=0;
        for(int nxt : adj[now])
        {
            if(vis[nxt]) continue;
            now=nxt; cnt++;
        }
        if(!cnt) break;
    }
    Answer(ans);
}

Compilation message (stderr)

library.cpp: In function 'int query(int, int)':
library.cpp:20:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j;
            ^
library.cpp: In function 'void Solve(int)':
library.cpp:52:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int mid=lo+hi>>1, t;
                     ~~^~~
library.cpp:64:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int mid=lo+hi>>1, t;
                     ~~^~~
library.cpp:35:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j;
            ^

• Subtask 1: 19 / 19
• Subtask 2: 0 / 81