Submission #630881

#	Time	Username	Problem	Language	Result	Execution time	Memory
630881		inksamurai	Pohlepko (COCI16_pohlepko)	C++17	80 / 80	75 ms	55236 KiB

pohlepko

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3phCa4T ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}
// e

const int di[]={1,0};
const int dj[]={0,1};

signed main(){
_3phCa4T;
	int h,w;
	cin>>h>>w;
	vec(vec(char)) a(h,vec(char)(w));
	rep(i,h){
		rep(j,w){
			cin>>a[i][j];
		}
	}
	using T=pair<int,pii>;
	vec(vec(T)) dp(h,vec(T)(w,T(0,pii(-1,-1))));
	dp[0][0]={1,{-1,-1}};
	queue<pii> que;
	que.push(pii(0,0));
	rep(_,h+w){
		char ch='z';
		vec(pair<pii,pii>) delay;
		while(sz(que)){
			auto top=que.front();
			que.pop();
			int i=top.fi,j=top.se;
			rep(dir,2){
				int ni=i+di[dir],nj=j+dj[dir];
				if(ni<0 or nj<0 or ni>=h or nj>=w) continue;
				delay.pb({pii(ni,nj),pii(i,j)});
				ch=min(ch,a[ni][nj]);
			}
		}
		for(auto fp:delay){
			pii p=fp.fi,q=fp.se;
			int i=p.fi,j=p.se;
			if(a[i][j]==ch and dp[i][j].fi==0){
				dp[i][j].fi=1;
				dp[i][j].se=q;
				que.push(pii(i,j));
			}
		}
	}
	assert(dp[h-1][w-1].fi);
	int i=h-1,j=w-1;
	vec(char) pns;
	while(i>=0){
		pns.pb(a[i][j]);
		int ni=dp[i][j].se.fi;
		int nj=dp[i][j].se.se;
		i=ni,j=nj;
	}
	reverse(pns.begin(), pns.end());
	for(auto ch:pns){
		cout<<ch;
	}
}

• Subtask 1: 80 / 80