제출 #132366

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
132366		dragonslayerit	Teleporters (IOI08_teleporters)	C++14	70 / 100	1078 ms	41308 KiB

teleporters

#include <cstdio>
#include <map>
#include <vector>
#include <algorithm>

int xs[2000005];
int ys[2000005];

bool vis[2000005];

int next[2000005];

int explore(int a){
  int len=0;
  while(!vis[a]){
    vis[a]=true;
    a=next[a];
    len++;
  }
  return len;
}

int main(){
  int N,M;
  scanf("%d %d",&N,&M);
  for(int i=0;i<N;i++){
    scanf("%d %d",&xs[i<<1],&xs[i<<1|1]);
  }
  std::copy(xs,xs+N*2,ys);
  std::sort(ys,ys+N*2);
  for(int i=0;i<N*2;i++){
    next[std::lower_bound(ys,ys+N*2,xs[i])-ys]=
      std::lower_bound(ys,ys+N*2,xs[i^1])-ys+1;
  }
  vis[N*2]=true;
  int score=explore(0);
  std::vector<int> cycles;
  for(int i=1;i<N*2;i++){
    cycles.push_back(explore(i));
  }
  std::sort(cycles.begin(),cycles.end(),std::greater<int>());
  for(int i=0;i<std::min<int>(M,cycles.size());i++){
    score+=cycles[i];
  }
  printf("%d\n",score+M*2);
  return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

teleporters.cpp: In function 'int main()':
teleporters.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&N,&M);
   ~~~~~^~~~~~~~~~~~~~~
teleporters.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&xs[i<<1],&xs[i<<1|1]);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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