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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#22734 | #2365. Flight Collision | hy_zheng_zai_nei_juan# | WA | 5ms | 7760kb | C++20 | 2.4kb | 2022-03-10 15:48:05 | 2022-04-30 01:36:38 |
Judging History
answer
#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<vector>
#include<queue>
#include<algorithm>
#include<string>
#include<sstream>
#include<cctype>
#include<cmath>
#include<iomanip>
#include<map>
#include<stack>
#include<set>
#include<functional>
#define in(x) x=read()
#define qr read()
#define int ll
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
namespace fastIO
{
#define BUF_SIZE 100000
bool IOerror=0;
inline char nc()
{
static char buf[BUF_SIZE],*p1=buf+BUF_SIZE,*pend=buf+BUF_SIZE;
if (p1==pend){
p1=buf; pend=buf+fread(buf,1,BUF_SIZE,stdin);
if (pend==p1){IOerror=1;return -1;}
}
return *p1++;
}
inline bool blank(char ch){return ch==' '||ch=='\n'||ch=='\r'||ch=='\t';}
inline ll read()
{
bool sign=0; char ch=nc();ll x=0;
for (;blank(ch);ch=nc());
if (IOerror)return 0;
if (ch=='-')sign=1,ch=nc();
for (;ch>='0'&&ch<='9';ch=nc())x=x*10+ch-'0';
if (sign)x=-x;
return x;
}
#undef BUF_SIZE
};
using namespace fastIO;
int x[1000010],v[1000010];
struct node
{
int x,y;
};
set<int>s;
int calc(node a)
{
if(v[a.x]<=v[a.y])return 1e16;
return 1.0*(x[a.y]-x[a.x])/(v[a.x]-v[a.y]);
}
bool operator < (const node& a,const node& b)
{
return calc(a)>calc(b);
}
vector<int>ans;
int crash[1000010];
priority_queue<node>q;
signed main()
{
//freopen(".in","r",stdin);
//freopen(".out","w",stdout);
int n=qr;
for(int i=1;i<=n;i++)in(x[i]),in(v[i]),s.insert(i);
for(int i=1;i<n;i++)
{
q.push((node){i,i+1});
}
while(!q.empty())
{
node now=q.top();q.pop();
// cout<<now.x<<','<<now.y<<'\n';
if(calc(now)>1e15)break;
if(!(crash[now.x]&&crash[now.y]))
{
if(crash[now.y])
{
auto suf=s.lower_bound(now.y);
if(suf!=s.end())q.push((node){now.x,*suf});
}
else if(crash[now.x])
{
auto pre=s.lower_bound(now.x);
if(pre!=s.begin())q.push((node){*--pre,now.y});
}
else
{
crash[now.x]=crash[now.y]=1;
s.erase(now.x),s.erase(now.y);
auto pre=s.lower_bound(now.x);
auto suf=s.lower_bound(now.y);
if(pre!=s.begin()&&suf!=s.end())q.push((node){*--pre,*suf});
}
}
}
for(int i=1;i<=n;i++)if(!crash[i])ans.push_back(i);
cout<<ans.size()<<'\n';
for(auto i:ans)cout<<i<<' ';
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 4ms
memory: 7760kb
input:
1 -4 13
output:
1 1
result:
ok 2 lines
Test #2:
score: 0
Accepted
time: 5ms
memory: 7684kb
input:
5 1 1000000000 2 1000000000 3 -1000000000 4 -1000000000 5 -1000000000
output:
1 5
result:
ok 2 lines
Test #3:
score: 0
Accepted
time: 2ms
memory: 7676kb
input:
3 -1000000000 1 999999999 0 1000000000 0
output:
1 3
result:
ok 2 lines
Test #4:
score: 0
Accepted
time: 4ms
memory: 7688kb
input:
2 5 4 10 5
output:
2 1 2
result:
ok 2 lines
Test #5:
score: -100
Wrong Answer
time: 3ms
memory: 7680kb
input:
9 10 10 20 7 30 5 40 0 42 0 50 -1 60 -2 70 -10 80 -12
output:
1 5
result:
wrong answer 2nd lines differ - expected: '1', found: '5 '