Submission #709449

#	Time	Username	Problem	Language	Result	Execution time	Memory
709449		myrcella	Rope (JOI17_rope)	C++17	80 / 100	2529 ms	246196 KiB

rope

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

#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf 0x3f
#define rep(i,a,b) for (int i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define ll long long
#define mod 1000000007
#define ALL(x) x.begin(),x.end()
void inc(int &a,int b) {a=(a+b)%mod;}
void dec(int &a,int b) {a=(a-b+mod)%mod;}
int lowbit(int x) {return x&(-x);}
ll p0w(ll base,ll p) {ll ret=1;while(p>0){if (p%2ll==1ll) ret=ret*base%mod;base=base*base%mod;p/=2ll;}return ret;}

const int maxn = 5010;

int n,m;
int c[maxn*1000];
int cntt[maxn][maxn],cnt[maxn];
int ans[maxn];
int tmp[maxn],tmpp[maxn];

void solve(int id) {
	rep(i,0,m) {
		tmp[i]=tmpp[i]=0;
		rep(j,0,m) cntt[i][j]=0;
	}
	if (id==1) tmpp[c[0]]++;
	for (int i=id;i<n;i+=2) {
		if (i+1<n) cntt[c[i]][c[i+1]]++,cntt[c[i+1]][c[i]]++,tmpp[c[i]]+=2;
		else tmpp[c[i]]++;
		if (i+1<n and c[i]!=c[i+1]) {
			tmp[c[i]]++;
			tmp[c[i+1]]++;
			tmpp[c[i+1]]+=2;
		}
	}
	rep(i,0,m) {
		ans[i] = min(ans[i],n-cnt[i]);
		rep(j,0,m) {
			if (i==j) continue;
			ans[i] = min(ans[i],(n-tmpp[i])-(cnt[j]-cntt[i][j])+tmp[i]);
//			cout<<i<<" "<<j<<" "<<(n-tmpp[i])<<" "<<(cnt[j]-cntt[i][j])<<" "<<tmp[i]<<endl;
		}
	}
}

int main() {
//	freopen("input.txt","r",stdin);	
	std::ios::sync_with_stdio(false);cin.tie(0);
	cin>>n>>m;
	rep(i,0,m) ans[i] = n;
	rep(i,0,n) {
		cin>>c[i];
		c[i]--;
		cnt[c[i]]++;
	}
	solve(0);
	solve(1);
	rep(i,0,m) cout<<ans[i]<<"\n";
	return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 30 / 30
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 0 / 20