Submission #941703

#	Time	Username	Problem	Language	Result	Execution time	Memory
941703		benjaminkleyn	Highway design (CEOI12_highway)	C++17	70 / 100	1 ms	600 KiB

highway

#include <bits/stdc++.h>
#include "office.h"
using namespace std;
typedef long long ll;


int main()
{
    cin.tie(0)->sync_with_stdio(0);

    int n = GetN();
    vector<int> otherline;
    int a, b;
    if (isOnLine(1, 2, 3))
    {
        // [{1, 2, 3}]
        a = 1;
        b = 2;
        if (!isOnLine(1, 2, 4))
            otherline.push_back(4);
    }
    else if (isOnLine(1, 2, 4))
    {
        // [{1, 2}, {3}]
        a = 1;
        b = 2;
        otherline = {3};
    }
    else if (isOnLine(2, 3, 4))
    {
        // [{2, 3}, {1}]
        a = 2;
        b = 3;
        otherline = {1};
    }
    else if (isOnLine(2, 3, 4))
    {
        // [{3, 1}, {2}]
        a = 1;
        b = 3;
        otherline = {2};
    }
    else
    {
        // [{1, 2}, {3, 4}] or [{1, 3}, {2, 4}] or [{2, 3}, {1, 4}].
        if (isOnLine(1, 2, 5) || isOnLine(3, 4, 5))
        {
            Answer(1, 2, 3, 4);
            return 0;
        }
        if (isOnLine(1, 3, 5) || isOnLine(2, 4, 5))
        {
            Answer(1, 3, 2, 4);
            return 0;
        }
        Answer(2, 3, 1, 4);
        return 0;
    }
    for (int i = 5; i + 1 <= n && otherline.size() < 2; i += 2)
    {
        if (isOnLine(a, i, i + 1))
            continue;
        if (isOnLine(a, b, i + 1))
            otherline.push_back(i);
        else if (isOnLine(a, b, i))
            otherline.push_back(i + 1);
        else
        {
            otherline.push_back(i);
            otherline.push_back(i + 1);
            break;
        }
    }
    if (n % 2 && otherline.size() < 2)
        otherline.push_back(n);
    Answer(a, b, otherline[0], otherline[1]);

    return 0;
}

Compilation message (stderr)

office.c: In function 'int isOnLine(int, int, int)':
office.c:85:13: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   85 |     _Fin(0, "Protocol error");
      |             ^~~~~~~~~~~~~~~~
office.c:88:13: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   88 |     _Fin(0, "Protocol error");
      |             ^~~~~~~~~~~~~~~~
office.c:92:17: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
   92 |     _Fin(false, "Too many questions");
      |                 ^~~~~~~~~~~~~~~~~~~~
office.c:83:7: warning: unused variable 'i' [-Wunused-variable]
   83 |   int i;
      |       ^
office.c: In function 'void Answer(int, int, int, int)':
office.c:123:13: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  123 |     _Fin(0, "Protocol error");
      |             ^~~~~~~~~~~~~~~~
office.c:128:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  128 |       if( (-_Apa[na1]==_N-3) && (na2!=na1) && (nb2!=na1) ||
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:130:21: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  130 |          _Fin(true, "Correct");
      |                     ^~~~~~~~~
office.c:132:22: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  132 |          _Fin(false, "Wrong answer");
      |                      ^~~~~~~~~~~~~~
office.c:134:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  134 |       if( (-_Apa[na2]==_N-3) && (na1!=na2) && (nb1!=na2) ||
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
office.c:136:21: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  136 |          _Fin(true, "Correct");
      |                     ^~~~~~~~~
office.c:138:22: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  138 |          _Fin(false, "Wrong answer");
      |                      ^~~~~~~~~~~~~~
office.c:140:19: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  140 |       _Fin(false, "Wrong answer");
      |                   ^~~~~~~~~~~~~~
office.c:142:14: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
  142 |   _Fin(true, "Correct");
      |              ^~~~~~~~~
office.c:120:27: warning: unused variable 'pont' [-Wunused-variable]
  120 |   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]
   33 |     scanf("%d", &_N);
      |     ~~~~~^~~~~~~~~~~

• Subtask 1: 70 / 100