Submission #62814

#TimeUsernameProblemLanguageResultExecution timeMemory
62814eriksuenderhaufHighway design (CEOI12_highway)C++11
100 / 100
17 ms3040 KiB
#include <bits/stdc++.h>
#include "office.h"
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%I64d", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%I64d\n", (n))
#define pii pair<int, int>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vi vector<int>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 1e6 + 5;
const double eps = 1e-9;
deque<vi> cur;

void brute()
{
    vi a, b;
    for (int i = 1; i < 3; i++)
        for (int j = i + 1; j <= 3; j++)
        {
            int o1 = isOnLine(i, j, 4);
            int o2 = isOnLine(i, j, 5);
            int o3 = isOnLine(i, j, 6);
            if (o1 + o2 + o3 == 0)
                continue;
            a.pb(i), a.pb(j), b.pb(6 - i - j);
            if (o1 == 0)
                b.pb(4);
            if (o2 == 0)
                b.pb(5);
            if (o3 == 0)
                b.pb(6);
            Answer(a[0], a[1], b[0], b[1]);
            exit(0);
        }
    exit(0);
}

vi pot;

int main()
{
    int n = GetN();
    int o1 = isOnLine(1, 2, 3), o2 = isOnLine(4, 5, 6);
    if (o1 == 0 && o2 == 0)
        brute();
    if (o1 == 0)
        pot.pb(1), pot.pb(2), pot.pb(3);
    else
        cur.pb({1,2,3});
    if (o2 == 0)
        pot.pb(4), pot.pb(5), pot.pb(6);
    else
        cur.pb({4,5,6});
    for (int i = 7; i + 2 <= n; i += 3)
    {
        o1 = isOnLine(i, i + 1, i + 2);
        if (o1 == 0)
        {
            pot.pb(i), pot.pb(i + 1), pot.pb(i + 2);
            if (pot.size() == 6)
            {
                vi t1 = cur.front();
                vi t2;
                for (int i = 0; i < 6; i++)
                    if (isOnLine(t1[0], t1[1], pot[i]) == 0)
                        t2.pb(pot[i]);
                Answer(t1[0], t1[1], t2[0], t2[1]);
                exit(0);
            }
        }
        else
            cur.pb({i,i+1,i+2});
    }
    while (cur.size() > 2)
    {
        vi t1 = cur.back(); cur.pop_back();
        vi t2 = cur.back(); cur.pop_back();
        vi t3 = cur.back(); cur.pop_back();
        o1 = isOnLine(t1[0], t2[0], t3[0]);
        if (o1 == 0)
        {
            if (isOnLine(t1[0], t1[1], t2[0]) == 1)
                Answer(t1[0], t1[1], t3[0], t3[1]);
            else
                Answer(t1[0], t1[1], t2[0], t2[1]);
            exit(0);
        }
        cur.push_front({t1[0], t2[0], t3[0]});
    }
    while (cur.size() > 1)
    {
        vi t1 = cur.back(); cur.pop_back();
        vi t2 = cur.back(); cur.pop_back();
        o1 = isOnLine(t1[0], t1[1], t2[0]);
        if (o1 == 0)
        {
            Answer(t1[0], t1[1], t2[0], t2[1]);
            exit(0);
        }
        cur.push_front({t1[0], t1[1], t2[0]});
    }
    // at most 5 points over
    vi t1 = cur.back(), t2;
    int fl = 0;
    for (int i = 0; i < pot.size(); i++)
        if (i == pot.size() - 1 && t2.empty())
            t2.pb(pot[i]);
        else if (t2.size() != 2 && isOnLine(t1[0], t1[1], pot[i]) == 0)
            t2.pb(pot[i]);
    if (t2.size() > 1)
        Answer(t1[0], t1[1], t2[0], t2[1]);
    for (int i = n - (n % 3) + 1; i <= n; i++)
    {
        if (i == n - 1 && t2.empty())
            t2.pb(i);
        else if (i == n && t2.size() == 1)
            t2.pb(i);
        else if (t2.size() != 2 && isOnLine(t1[0], t1[1], i) == 0)
            t2.pb(pot[i]);
    }
    Answer(t1[0], t1[1], t2[0], t2[1]);
    return 0;
}

Compilation message (stderr)

highway.cpp: In function 'int main()':
highway.cpp:123:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < pot.size(); i++)
                     ~~^~~~~~~~~~~~
highway.cpp:124:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (i == pot.size() - 1 && t2.empty())
             ~~^~~~~~~~~~~~~~~~~
highway.cpp:122:9: warning: unused variable 'fl' [-Wunused-variable]
     int fl = 0;
         ^~
office.c: In function 'int isOnLine(int, int, int)':
office.c:85:29: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(0, "Protocol error");
                             ^
office.c:88:29: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(0, "Protocol error");
                             ^
office.c:92:37: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(false, "Too many questions");
                                     ^
office.c:83:7: warning: unused variable 'i' [-Wunused-variable]
   int i;
       ^
office.c: In function 'void Answer(int, int, int, int)':
office.c:123:29: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     _Fin(0, "Protocol error");
                             ^
office.c:128:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
       if( (-_Apa[na1]==_N-3) && (na2!=na1) && (nb2!=na1) ||
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:130:30: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(true, "Correct");
                              ^
office.c:132:36: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(false, "Wrong answer");
                                    ^
office.c:134:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
       if( (-_Apa[na2]==_N-3) && (na1!=na2) && (nb1!=na2) ||
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:136:30: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(true, "Correct");
                              ^
office.c:138:36: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
          _Fin(false, "Wrong answer");
                                    ^
office.c:140:33: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
       _Fin(false, "Wrong answer");
                                 ^
office.c:142:23: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   _Fin(true, "Correct");
                       ^
office.c:120:27: warning: unused variable 'pont' [-Wunused-variable]
   int na1, nb1, na2, nb2, pont;
                           ^~~~
office.c: In function 'void _doInit()':
office.c:33:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &_N);
     ~~~~~^~~~~~~~~~~
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