Submission #970751

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
970751	2024-04-27T08:07:02 Z	hihihihaw	Mobile (BOI12_mobile)	C++17	50 / 100	822 ms	12852 KB

mobile

#pragma GCC optimize("O3,unroll-loops")    
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define pb push_back
#define pii pair<int,int>
#define sz(v) (int)v.size()
#define fi first
#define se second
#define INF 1223372036854775807
#define MOD 1000000007
#define cint(x) int x;cin>>x;
#define cinarr(a,n) int a[n];for (int i=0;i<n;i++) cin>>a[i];
#define coutarr(a) for (auto d:a)cout<<d<<" "; cout<<endl;
#define coutarrD(a) for (auto d:a) cout<<d.fi<<","<<d.se<<" "; cout<<endl;
#define AYBERK_SARICA ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define endl '\n'
#define ld long double
#define mid (start+end)/2

int t=1;
int interactive=0;
int usaco=0;
int testCase=0;
int n,k;
pair<ld,ld> v[100023];
bool f(ld x){
    vector<pair<ld,ld>> z;
    for (int i=0;i<n;i++){
        if (x*x-v[i].se*v[i].se>0){
            ld y=sqrt(x*x-v[i].se*v[i].se);
            if (v[i].fi+y<0 || v[i].fi-y>k) continue;
            z.pb({max(v[i].fi-y,(ld)0),min(v[i].fi+y,(ld)k)});
        }
    }
    sort(z.begin(),z.end());
    ld b=0;
    for (int i=0;i<sz(z);i++){
        if (z[i].fi>b){
            return false;
        }
        else{
            b=max(z[i].se,b);
        }
    }
    if (b!=k) return false;
    return true;
}

void solve(){
    cin>>n>>k;
    for (int i=0;i<n;i++){
        ld x,y;
        cin>>x>>y;
        v[i]={x,y};
    }
    ld l=0,r=2000000000;
    int y=42;
    while (y--){
        ld m=(l+r)/2;
        if (f(m)) r=m;
        else l=m;
    }
    cout<<setprecision(15)<<l<<endl;
    

    
    
    

    
    


    
    
    
    
    

    

    
    

    

    
}



 
 
    
 
 
 
 
 
int32_t main(){
    AYBERK_SARICA;
    if (usaco){
        freopen("socdist.in", "r", stdin);
        freopen("socdist.out", "w", stdout);
    }
    if (!interactive){
    #ifdef Local
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
        //freopen("wormsort.out", "w", stdout);
    #endif
    }
    if (t==1) solve();
    else{
        cin>>t;
        while (t--){testCase++;solve();}
    }
    
        
    return 0;
}

Compilation message

mobile.cpp: In function 'int32_t main()':
mobile.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen("socdist.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen("socdist.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

#	Verdict	Memory	Grader output
1	Correct	348 KB	Output is correct
2	Correct	348 KB	Output is correct
3	Correct	344 KB	Output is correct
4	Correct	348 KB	Output is correct

Subtask #2
4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	1 ms	496 KB	Output is correct
3	Correct	1 ms	344 KB	Output is correct
4	Correct	1 ms	348 KB	Output is correct

Subtask #3
4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	9 ms	800 KB	Output is correct
2	Correct	11 ms	784 KB	Output is correct
3	Correct	6 ms	604 KB	Output is correct
4	Correct	5 ms	712 KB	Output is correct

Subtask #4
4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	16 ms	1120 KB	Output is correct
2	Correct	19 ms	1188 KB	Output is correct
3	Correct	25 ms	1040 KB	Output is correct
4	Correct	11 ms	1036 KB	Output is correct

Subtask #5
4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	16 ms	1120 KB	Output is correct
2	Correct	19 ms	1060 KB	Output is correct
3	Correct	26 ms	1036 KB	Output is correct
4	Correct	11 ms	1060 KB	Output is correct

Subtask #6
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	15 ms	1092 KB	Output is correct
2	Correct	19 ms	1060 KB	Output is correct
3	Correct	29 ms	1040 KB	Output is correct
4	Correct	10 ms	1056 KB	Output is correct
5	Correct	17 ms	1032 KB	Output is correct

Subtask #7
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	237 ms	9516 KB	Output is correct
2	Correct	462 ms	11044 KB	Output is correct
3	Correct	306 ms	6436 KB	Output is correct
4	Correct	169 ms	9912 KB	Output is correct
5	Correct	203 ms	6328 KB	Output is correct

Subtask #8
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	284 ms	11224 KB	Output is correct
2	Correct	232 ms	10492 KB	Output is correct
3	Correct	233 ms	11060 KB	Output is correct
4	Correct	181 ms	10436 KB	Output is correct
5	Correct	149 ms	11420 KB	Output is correct

Subtask #9
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	503 ms	10692 KB	Output is correct
2	Correct	482 ms	9740 KB	Output is correct
3	Correct	683 ms	9888 KB	Output is correct
4	Correct	117 ms	10684 KB	Output is correct
5	Correct	315 ms	11144 KB	Output is correct

Subtask #10
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	451 ms	10820 KB	Output is correct
2	Correct	621 ms	11452 KB	Output is correct
3	Correct	816 ms	10840 KB	Output is correct
4	Correct	119 ms	12664 KB	Output is correct
5	Correct	285 ms	12852 KB	Output is correct

Subtask #11
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	217 ms	10832 KB	Output is correct
2	Correct	621 ms	11344 KB	Output is correct
3	Correct	822 ms	11416 KB	Output is correct
4	Correct	116 ms	10720 KB	Output is correct
5	Correct	278 ms	10916 KB	Output is correct

Subtask #12
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	37 ms	6768 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #13
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	38 ms	6740 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #14
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	31 ms	6744 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #15
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	37 ms	6748 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #16
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	31 ms	6812 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #17
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	37 ms	6740 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #18
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	32 ms	6780 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #19
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	38 ms	6784 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #20
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	31 ms	6788 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-

Subtask #21
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	37 ms	6740 KB	Execution killed with signal 11
2	Halted	0 ms	0 KB	-