Submission #567183

#	Time	Username	Problem	Language	Result	Execution time	Memory
567183		jamezzz	Sightseeing in Kyoto (JOI22_kyoto)	C++17	40 / 100	194 ms	45376 KiB

kyoto

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

#ifdef DEBUG
#define dbg(...) printf(__VA_ARGS__);
#define getchar_unlocked getchar
#else
#define dbg(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb push_back
#define sz(x) (int)x.size()
#define mnto(x,y) x=min(x,(__typeof__(x))y)
#define mxto(x,y) x=max(x,(__typeof__(x))y)
#define INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(), x.end()
#define disc(x) sort(all(x));x.resize(unique(all(x))-x.begin());
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vll;
mt19937 rng(time(0));

#define mod 1000000007

inline int add(int a,int b){
	int r=a+b;
	while(r>=mod)r-=mod;
	while(r<0)r+=mod;
	return r;
}

inline int mult(int a,int b){
	return (int)(((ll)(a*b))%mod);
}

inline int rd(){
	int x=0;
	char ch=getchar_unlocked();
	while(!(ch&16))ch=getchar();//keep reading while current character is whitespace
    while(ch&16){//this will break when ‘\n’ or ‘ ‘ is encountered
		x=(x<<3)+(x<<1)+(ch&15);
		ch=getchar_unlocked();
	}
	return x;
}

#define maxn 200005
#define maxx 2005

int h,w,a[maxn],pa[maxn],sa[maxn],b[maxn],pb[maxn],sb[maxn];
ll memo[maxx][maxx];
vector<pll> aa,bb;

ll dp(int i,int j){
	if(i==h&&j==w)return 0;
	if(i>h||j>w)return LINF;
	if(memo[i][j]!=-1)return memo[i][j];
	return memo[i][j]=min(dp(i+1,j)+bb[j].fi*(aa[i+1].se-aa[i].se),dp(i,j+1)+aa[i].fi*(bb[j+1].se-bb[j].se));
}

int main(){
	sf("%d%d",&h,&w);
	for(int i=1;i<=h;++i)sf("%d",&a[i]);
	for(int i=1;i<=w;++i)sf("%d",&b[i]);
	pa[0]=sa[h+1]=pb[0]=sb[w+1]=INF;
	for(int i=1;i<=h;++i)pa[i]=min(pa[i-1],a[i]);
	for(int i=h;i>=1;--i)sa[i]=min(sa[i+1],a[i]);
	for(int i=1;i<=w;++i)pb[i]=min(pb[i-1],b[i]);
	for(int i=w;i>=1;--i)sb[i]=min(sb[i+1],b[i]);
	for(int i=1;i<=h;++i)if(pa[i-1]>a[i]||a[i]<sa[i+1])aa.pb({a[i],i});
	for(int i=1;i<=w;++i)if(pb[i-1]>b[i]||b[i]<sb[i+1])bb.pb({b[i],i});
	h=aa.size()-1,w=bb.size()-1;
	aa.pb({INF,INF});bb.pb({INF,INF});
	memset(memo,-1,sizeof memo);
	/*
	for(int i=0;i<=h;++i){
		for(int j=0;j<=w;++j){
			pf("%3lld ",dp(i,j));
		}
		pf("\n");
	}
	*/
	pf("%lld\n",dp(0,0));
}

Compilation message (stderr)

kyoto.cpp: In function 'int main()':
kyoto.cpp:72:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |  sf("%d%d",&h,&w);
      |    ^
kyoto.cpp:73:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |  for(int i=1;i<=h;++i)sf("%d",&a[i]);
      |                         ^
kyoto.cpp:74:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |  for(int i=1;i<=w;++i)sf("%d",&b[i]);
      |                         ^

• Subtask 1: 10 / 10
• Subtask 2: 30 / 30
• Subtask 3: 0 / 60