Submission #659555

#	Time	Username	Problem	Language	Result	Execution time	Memory
659555		jiahng	Sure Bet (CEOI17_sure)	C++14	100 / 100	161 ms	5184 KiB

sure

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define int ll
typedef pair<int,int> pi;
typedef vector <int> vi;
typedef vector <pi> vpi;
typedef pair<pi, ll> pii;
typedef set <ll> si;
typedef long double ld;
#define f first
#define s second
#define mp make_pair
#define FOR(i,s,e) for(int i=s;i<=int(e);++i)
#define DEC(i,s,e) for(int i=s;i>=int(e);--i)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lbd(x, y) lower_bound(all(x), y)
#define ubd(x, y) upper_bound(all(x), y)
#define aFOR(i,x) for (auto i: x)
#define mem(x,i) memset(x,i,sizeof x)
#define fast ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define maxn 2000010
#define INF (ll)1e18
#define MOD 1000000007
typedef pair <vi, int> pvi;
typedef pair <int,pi> ipi;
typedef vector <pii> vpii;


int N;
double A[maxn],B[maxn];
double a,b;
double ssA[maxn], ssB[maxn];
int32_t main(){
    cin >> N;
    FOR(i,1,N){
        cin >> A[i] >> B[i];
    }
    sort(A+1,A+N+1,greater <double>()); sort(B+1,B+N+1,greater <double>());
    FOR(i,1,N) ssA[i] = ssA[i-1] + A[i];
    FOR(i,1,N) ssB[i] = ssB[i-1] + B[i];
    double ans = 0;
    FOR(i,1,N){
        int y = lower_bound(ssB+1,ssB+N+1,ssA[i]) - ssB;
        if (y == N+1) continue;
        ans = max(ans, ssA[i] - (i + y));
    }
    FOR(i,1,N){
        int x = lower_bound(ssA+1,ssA+N+1,ssB[i]) - ssA;
        if (x == N+1) continue;
        ans = max(ans, ssB[i] - (i + x));
    }
    printf("%.4lf", (double)ans);
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40