Submission #78605

#	Time	Username	Problem	Language	Result	Execution time	Memory
78605		MrTEK	Highway design (CEOI12_highway)	C++14	100 / 100	4 ms	1020 KiB

highway

#include <bits/stdc++.h>
#include "office.h"

using namespace std;

typedef long long int ll;
typedef pair<int,int> ii;

const int N = 1e5 + 5;

int n;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL); cout.tie(NULL);
  n = GetN();
  if (isOnLine(1,2,3)) {
    // cerr << "yes" << endl;
    int a = 1,b = 2,x,y;
    vector <int> v;
    for (int i = 4 ; i < n ; i += 2)
      if (!isOnLine(a,i,i + 1))
        v.push_back(i);
    // cerr << (int)v.size() << endl;
    if (isOnLine(a,b,v.back())) {
      x = v.back() + 1;
      v.pop_back();
      if (isOnLine(a,b,v.back())) y = v.back() + 1;
      else y = v.back();
      Answer(a,b,x,y);
    }
    else
      Answer(a,b,v.back(),v.back() + 1);
  }
  else if (isOnLine(4,5,6)) {
    // cerr << "2" << endl;
    int a = 4,b = 5,x,y;
    vector <int> v;
    for (int i = 1 ; i <= 3 ; i++)
      if (!isOnLine(a,b,i))
        x = i;
    for (int i = 7 ; i < n ; i += 2)
      if (!isOnLine(a,i,i + 1))
        y = i;
    if (isOnLine(a,b,y)) {
      Answer(a,b,x,y + 1);
    }
    else
      Answer(a,b,x,y);
  }
  else {
    // cerr << "3" << endl;
    int a = -1, b = -1,x,y;
    for (int i = 4 ; i <= 6 ; i++)
      if (isOnLine(1,2,i))
        a = 1,b = 2,x = 3;
    if (a == -1) {
      for (int i = 4 ; i <= 6 ; i++)
        if (isOnLine(1,3,i))
          a = 1, b = 3,x = 2;
    }
    if (a == -1)
      a = 2,b = 3, x = 1;
    for (int i = 4 ; i <= 6 ; i++)
      if (!isOnLine(a,b,i))
        y = i;
    Answer(a,b,x,y);
  }
}

Compilation message (stderr)

highway.cpp: In function 'int main()':
highway.cpp:67:11: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
     Answer(a,b,x,y);
     ~~~~~~^~~~~~~~~
highway.cpp:49:13: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
       Answer(a,b,x,y);
       ~~~~~~^~~~~~~~~
highway.cpp:49:13: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
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);
     ~~~~~^~~~~~~~~~~

• Subtask 1: 100 / 100