oj.uz

Submission #711039

# Submission time Handle Problem Language Result Execution time Memory
711039 2023-03-16T07:32:58 Z ToroTN Sure Bet (CEOI17_sure) C++14
100 / 100
 78 ms 3812 KB 
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
int n,st,md,ed;
double a,b,ans=0;
vector<double> v1,v2;
int main()
{
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        scanf("%lf%lf",&a,&b);
        v1.pb(-a),v2.pb(-b);
    }
    v1.pb(-1e9),v2.pb(-1e9);
    sort(v1.begin(),v1.end());
    sort(v2.begin(),v2.end());
    for(int i=1;i<=n;i++)v1[i]=-v1[i],v2[i]=-v2[i];
    for(int i=2;i<=n;i++)v1[i]=v1[i-1]+v1[i],v2[i]=v2[i-1]+v2[i];
    v1[0]=0,v2[0]=0;
    /*for(int i=0;i<=n;i++)
    {
        printf("%lf %lf\n",v1[i],v2[i]);
    }*/
    for(int i=1;i<=2*n;i++)
    {
        st=0,ed=i;
        while(ed>=st)
        {
            md=(st+ed)/2;
            if(md>n)
            {
                ed=md-1;
                continue;
            }
            if(i-md>n)
            {
                st=md+1;
                continue;
            }
            ans=max(ans,min(v1[md],v2[i-md])-i);
            if(v1[md]<=v2[i-md])
            {
                st=md+1;
            }else
            {
                ed=md-1;
            }
        }
        //printf("i=%d\n",i);
        //printf("%d %d %d\n",st,md,ed);
        st-=1;
        if(st>=0&&st<=n&&i-st>=0&&i-st<=n)
        {
            ans=max(ans,min(v1[st],v2[i-st])-i);
        }
        st+=1;
        if(st>=0&&st<=n&&i-st>=0&&i-st<=n)
        {
            ans=max(ans,min(v1[st],v2[i-st])-i);
        }
        st-=1;
        if(st>=0&&st<=n&&i-st>=0&&i-st<=n)
        {
            ans=max(ans,min(v1[st],v2[i-st])-i);
        }
    }
    printf("%.4lf\n",ans);
}

Compilation message

sure.cpp: In function 'int main()':
sure.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
sure.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         scanf("%lf%lf",&a,&b);
      |         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 296 KB Output is correct
8 Correct 1 ms 296 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 296 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 256 KB Output is correct
13 Correct 1 ms 308 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 296 KB Output is correct
8 Correct 1 ms 296 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 296 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 256 KB Output is correct
13 Correct 1 ms 308 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 69 ms 3356 KB Output is correct
18 Correct 67 ms 3396 KB Output is correct
19 Correct 67 ms 3380 KB Output is correct
20 Correct 69 ms 3420 KB Output is correct
21 Correct 71 ms 3812 KB Output is correct
22 Correct 70 ms 3328 KB Output is correct
23 Correct 68 ms 3388 KB Output is correct
24 Correct 78 ms 3420 KB Output is correct
25 Correct 72 ms 3372 KB Output is correct
26 Correct 71 ms 3756 KB Output is correct