Submission #136647

#	Time	Username	Problem	Language	Result	Execution time	Memory
136647		liwi	Pinball (JOI14_pinball)	C++11	100 / 100	939 ms	39252 KiB

pinball

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;

#define scan(x) do{while((x=getchar())<'0'); for(x-='0'; '0'<=(_=getchar()); x=(x<<3)+(x<<1)+_-'0');}while(0)
char _;
#define complete_unique(a) a.erase(unique(a.begin(),a.end()),a.end())
#define all(a) a.begin(),a.end()
#define println printf("\n");
#define readln(x) getline(cin,x);
#define pb push_back
#define endl "\n"
#define INT_INF 0x3f3f3f3f
#define LL_INF 0x3f3f3f3f3f3f3f3f
#define MOD 1000000007
#define mp make_pair
#define fastio cin.tie(0); cin.sync_with_stdio(0);

#define MAXN 100005

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
typedef unordered_map<int,int> umii;
typedef pair<int,int> pii;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef pair<int,pii> triple;
typedef int8_t byte;

mt19937 g1(time(0));

int randint(int a, int b){return uniform_int_distribution<int>(a, b)(g1);}
ll randlong(ll a,ll b){return uniform_int_distribution<long long>(a, b)(g1);}

ll gcd(ll a, ll b){return b == 0 ? a : gcd(b, a % b);}
ll lcm(ll a, ll b){return a*b/gcd(a,b);}
ll fpow(ll  b, ll exp, ll mod){if(exp == 0) return 1;ll t = fpow(b,exp/2,mod);if(exp&1) return t*t%mod*b%mod;return t*t%mod;}
ll divmod(ll i, ll j, ll mod){i%=mod,j%=mod;return i*fpow(j,mod-2,mod)%mod;}

struct node{
	int l,r;
	ll min;
};

int num_rows,num_cols;
ll dp[MAXN],res[MAXN],ans=LLONG_MAX/10;
pair<pii,pii> segs[MAXN];
node seg[12*MAXN];
vector<int> pos;
map<int,int> rev;

void build(int l, int r, int rt){
	seg[rt].l = l, seg[rt].r = r, seg[rt].min = LLONG_MAX/10;
	if(l == r) return;
	int mid = (l+r)/2;
	build(l,mid,rt<<1);
	build(mid+1,r,rt<<1|1);
}

void update(int pos, int rt, ll val){
	if(seg[rt].l == seg[rt].r){
		seg[rt].min = min(seg[rt].min,val);
		return;
	}
	int mid = (seg[rt].l+seg[rt].r)/2;
	if(pos <= mid) update(pos,rt<<1,val);
	else update(pos,rt<<1|1,val);
	seg[rt].min = min(seg[rt<<1].min,seg[rt<<1|1].min);
}

ll query(int l, int r, int rt){
	if(seg[rt].l == l && seg[rt].r == r) return seg[rt].min;
	int mid = (seg[rt].l+seg[rt].r)/2;
	if(r <= mid) return query(l,r,rt<<1);
	else if(l > mid) return query(l,r,rt<<1|1);
	return min(query(l,mid,rt<<1),query(mid+1,r,rt<<1|1));
}

int main(){
	scanf("%d %d",&num_rows,&num_cols);
	for(int i=1; i<=num_rows; i++){
		scanf(" %d %d %d %d",&segs[i].first.first,&segs[i].first.second,&segs[i].second.first,&segs[i].second.second);
		pos.pb(segs[i].first.first);
		pos.pb(segs[i].first.second);
		pos.pb(segs[i].second.first);
	}
	sort(all(pos)); complete_unique(pos);
	for(int i=1; i<=pos.size(); i++)
		rev[pos[i-1]] = i;

	for(int i=1; i<=num_rows; i++)
		dp[i] = LLONG_MAX/10;
	build(1,(int)pos.size(),1);
	for(int i=1; i<=num_rows; i++){
		if(segs[i].first.first == 1) dp[i] = segs[i].second.second;
		int l = segs[i].first.first, r = segs[i].first.second, m = segs[i].second.first;
		ll ndp = query(rev[l],rev[r],1)+segs[i].second.second;
		dp[i] = min(dp[i],ndp);
		update(rev[m],1,dp[i]);
		res[i]+=dp[i];
	}

	for(int i=1; i<=num_rows; i++)
		dp[i] = LLONG_MAX/10;
	build(1,(int)pos.size(),1);
	for(int i=1; i<=num_rows; i++){
		if(segs[i].first.second == num_cols) dp[i] = segs[i].second.second;
		int l = segs[i].first.first, r = segs[i].first.second, m = segs[i].second.first;
		ll ndp = query(rev[l],rev[r],1)+segs[i].second.second;
		dp[i] = min(dp[i],ndp);
		update(rev[m],1,dp[i]);
		res[i]+=dp[i];
	}

	for(int i=1; i<=num_rows; i++)
		ans = min(ans,res[i]-segs[i].second.second);
	if(ans == LLONG_MAX/10) printf("-1\n");
	else printf("%lld\n",ans);
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:93:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1; i<=pos.size(); i++)
               ~^~~~~~~~~~~~
pinball.cpp:85:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&num_rows,&num_cols);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp:87:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %d %d %d %d",&segs[i].first.first,&segs[i].first.second,&segs[i].second.first,&segs[i].second.second);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 18 / 18
• Subtask 3: 22 / 22
• Subtask 4: 49 / 49