Submission #169655

#	Time	Username	Problem	Language	Result	Execution time	Memory
169655		mhy908	Bulldozer (JOI17_bulldozer)	C++14	0 / 100	438 ms	524292 KiB

bulldozer

#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;
typedef pair<LL, LL> pll;
const LL llinf=98765431298754321;
LL gcd(LL a, LL b){return b?gcd(b, a%b):a;}
struct Q{
    int buho;
    LL p, q;
    bool operator<(const Q &b){
        if(buho!=b.buho)return buho<b.buho;
        if(buho>0)return p*b.q<b.p*q;
        return  p*b.q>b.p*q;
    }
    bool operator==(const Q &b){
        return buho==b.buho&&p==b.p&&q==b.q;
    }
};
int n;
pair<pll, int> point[2010];
vector<pair<Q, pii> > vc;
LL arr[2010];
int now[2010];
bool comp(pii a, pii b){
    if(a.F==b.F)return now[a.S]<now[b.S];
    return now[a.F]<now[b.F];
}
bool cmp(pair<Q, pii> a, pair<Q, pii> b){
    if(a.F==b.F)return a.S>b.S;
    return !(a.F<b.F);
}
bool cmp2(pair<pll, int> a, pair<pll, int> b){
    if(a.F.F==b.F.F)return a.F.S>b.F.S;
    return a.F.F<b.F.F;
}
struct SEGMENT_TREE {
    struct NODE {
        LL lmax, rmax, tmax, sum;
    } tree[8000];
    void updaterange(int point, int l, int r, int num, LL p) {
        if(l==r) {
            tree[point].lmax=p;
            tree[point].rmax=p;
            tree[point].tmax=p;
            tree[point].sum=p;
            return;
        }
        if(num<=(l+r)>>1)updaterange(point<<1, l, (l+r)>>1, num, p);
        else updaterange(point<<1|1, (l+r)>>1, r, num, p);
        tree[point].lmax=max(tree[point<<1].lmax, tree[point<<1].sum+tree[point<<1|1].lmax);
        tree[point].rmax=max(tree[point<<1|1].rmax, tree[point<<1|1].sum+tree[point<<1].rmax);
        tree[point].sum=tree[point<<1].sum+tree[point<<1|1].sum;
        tree[point].tmax=max(max(tree[point<<1].tmax, tree[point<<1|1].tmax), max(tree[point<<1].rmax+tree[point<<1|1].lmax, max(tree[point].lmax, tree[point].rmax)));
    }
}seg;
int main()
{
    scanf("%d", &n);
    for(register int i=1; i<=n; i++){
        scanf("%lld %lld %lld", &point[i].F.F, &point[i].F.S, &arr[i]);
        point[i].S=i;
    }
    for(register int i=1; i<=n; i++){
        for(register int j=1; j<i; j++){
            LL tx=point[i].F.F-point[j].F.F;
            LL ty=point[i].F.S-point[j].F.S;
            if(tx==0)continue;
            Q temp;
            if(tx*ty>0)temp.buho=1;
            else if(tx*ty==0)temp.buho=0;
            else temp.buho=-1;
            LL gcdd=gcd(llabs(tx), llabs(ty));
            tx=llabs(tx)/gcdd;
            ty=llabs(ty)/gcdd;
            temp.p=ty;
            temp.q=tx;
            vc.pb(mp(temp, mp(j, i)));
        }
    }
    sort(point+1, point+n+1, cmp2);
    sort(vc.begin(), vc.end(), cmp);
    for(register int i=1; i<=n; i++){
        seg.updaterange(1, 1, n, i, arr[point[i].S]);
        now[point[i].S]=i;
    }
    LL ans=max(0ll, seg.tree[1].tmax);
    register int pv=0;
    while(pv<vc.size()){
        vector<pii> tem;
        for(; pv<vc.size(); pv++){
            if(now[vc[pv].S.F]<now[vc[pv].S.S]){
                tem.pb(mp(vc[pv].S.F, vc[pv].S.S));
            }
            else{
                tem.pb(mp(vc[pv].S.S, vc[pv].S.F));
            }
            if(pv==vc.size()-1){
                pv++;
                break;
            }
            if(!(vc[pv].F==vc[pv+1].F)){
                pv++;
                break;
            }
        }
        sort(tem.begin(), tem.end(), comp);
        for(register int j=0; j<tem.size(); j++){
            seg.updaterange(1, 1, n, now[tem[j].F], arr[tem[j].S]);
            seg.updaterange(1, 1, n, now[tem[j].S], arr[tem[j].F]);
            swap(now[tem[j].F], now[tem[j].S]);
        }
        LL temp=seg.tree[1].tmax;
        ans=max(ans, temp);
    }
    printf("%lld", ans);
}

Compilation message (stderr)

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:96:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(pv<vc.size()){
           ~~^~~~~~~~~~
bulldozer.cpp:98:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(; pv<vc.size(); pv++){
               ~~^~~~~~~~~~
bulldozer.cpp:105:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(pv==vc.size()-1){
                ~~^~~~~~~~~~~~~
bulldozer.cpp:115:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(register int j=0; j<tem.size(); j++){
                               ~^~~~~~~~~~~
bulldozer.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
bulldozer.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld %lld", &point[i].F.F, &point[i].F.S, &arr[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 20
• Subtask 3: 0 / 35
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20