Submission #125354

#	Time	Username	Problem	Language	Result	Execution time	Memory
125354		figter001	Highway design (CEOI12_highway)	C++17	100 / 100	4 ms	760 KiB

highway

#include<bits/stdc++.h>
#include "office.h"
using namespace std;
 
int main(){ 
   int n = GetN();
  int res;
  int a,b,c;
  int w = 0;
  for(int i=1;i<=n;i+=2){
    a = i;
    b = i+1;
    c = i+2;
    res = isOnLine(a,b,c);
    if(res == 0)break;
  }
  w = 1;
  int lst = -1;
  int g = 0;
  for(int i=c+1;i<=n;i++){
    res = isOnLine(a,b,i);
    if(res == 1){
      g = c;
      c = i;
      break;
    }
    res = isOnLine(a,i,c);
    if(res == 1){
      g = b;
      b = i;
      swap(c,b);
      break;
    }
    res = isOnLine(i,b,c);
    if(res == 1){
      g = a;
      a = i;
      swap(c,a);
      break;
    }
    if(lst == -1)lst = i;
    else{
      pair<int,int> q;
      res = isOnLine(i,lst,a);
      if(res == 1)q = {b,c};
      res = isOnLine(i,lst,b);
      if(res == 1)q = {a,c};
      res = isOnLine(i,lst,c);
      if(res == 1)q = {a,b};
      Answer(lst,i,q.first,q.second);
      return 0;
    }
  }
  if(w + 2 <= a){
    Answer(a,b,w,w+1);
  }
  int x,y;
  for(int i=c+1;i<=n;i+=2){
    x = i;
    y = i+1;
    res = isOnLine(a,x,y);
    if(res == 0){
      break;
    }
  }
  res = isOnLine(a,b,x);
  if(res == 0){
    Answer(a,b,g,x);
    return 0;
  }
  res = isOnLine(a,b,y);
  if(res == 0){
    Answer(a,b,g,y);
    return 0;
  }
  return 0;
}

Compilation message (stderr)

highway.cpp: In function 'int main()':
highway.cpp:58:11: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(int i=c+1;i<=n;i+=2){
           ^
highway.cpp:55:11: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
     Answer(a,b,w,w+1);
     ~~~~~~^~~~~~~~~~~
highway.cpp:54:3: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(w + 2 <= a){
   ^~
highway.cpp:71:7: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   res = isOnLine(a,b,y);
   ~~~~^~~~~~~~~~~~~~~~~
highway.cpp:66:7: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   res = isOnLine(a,b,x);
   ~~~~^~~~~~~~~~~~~~~~~
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