Submission #292187

#	Time	Username	Problem	Language	Result	Execution time	Memory
292187		Namnamseo	Rope (JOI17_rope)	C++17	80 / 100	2593 ms	80352 KiB

rope

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pp;
#define all(x) (x).begin(),(x).end()
#define pb push_back

char *I;
int ri() {
	int ret = 0;
	while((*I<48 || *I>=58)) ++I;
	while(!(*I<48 || *I>=58)) ret=ret*10+(*I)-48,++I;
	return ret;
}
void read(int& x){ x = ri(); }
template<typename T,typename... Args>
void read(T& a,Args&... b){ read(a); read(b...); }

int n, m;
int col[1000010];

int ans[1000010];

vector<int> adj[1000010];
int self[1000010];

const int M=1048576;
int t[M<<1];

void upd(int p, int v){
	p+=M; t[p]+=v; p>>=1;
	while(p) t[p]=max(t[p*2], t[p*2+1]), p>>=1;
}

int rM(int l, int r){
	int ret=0;
	l+=M; r+=M;
	while(l<=r){
		if(l&1) ret=max(ret, t[l++]);
		if((r&1)==0) ret=max(ret, t[r--]);
		l>>=1; r>>=1;
	}
	return ret;
}

void Do(){
	for(auto& v:adj) v.clear(); memset(self, 0, sizeof(self)); memset(t, 0, sizeof(t));
    
    for(int i=1; i<=n; i+=2){
		if(i+1 <= n){
			int a=col[i], b=col[i+1];
			if(a == b){
				++self[a];
				upd(a, 2);
				continue;
			}
			adj[a].pb(b); adj[b].pb(a);
			upd(a, 1); upd(b, 1);
		} else upd(col[i], 1);
    }
    
    for(int i=1; i<=m; ++i){
		for(int x:adj[i]) upd(x, -1);
		int jib=rM(i, i); upd(i, -jib);
		ans[i]=min(ans[i],
			n-rM(1, m)-jib
		);
		for(int x:adj[i]) upd(x, 1);
		upd(i, jib);
    }
}

void Do2(){
	for(auto& v:adj) v.clear(); memset(self, 0, sizeof(self)); memset(t, 0, sizeof(t));
    
    upd(col[1], 1);
    for(int i=2; i<=n; i+=2){
		if(i+1 <= n){
			int a=col[i], b=col[i+1];
			if(a == b){
				++self[a];
				upd(a, 2);
				continue;
			}
			adj[a].pb(b); adj[b].pb(a);
			upd(a, 1); upd(b, 1);
		} else upd(col[i], 1);
    }
    
    for(int i=1; i<=m; ++i){
		for(int x:adj[i]) upd(x, -1);
		int jib=rM(i, i); upd(i, -jib);
		ans[i]=min(ans[i],
			n-rM(1, m)-jib
		);
		for(int x:adj[i]) upd(x, 1);
		upd(i, jib);
    }
}

#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>

int main()
{
	{ struct stat Z; fstat(0, &Z); I=(char*)mmap(0,Z.st_size,1,2,0,0); }
    read(n, m);
    for(int i=1; i<=n; ++i) read(col[i]);
    fill(ans+1, ans+m+1, n+1);
    Do(); Do2();
    reverse(col+1, col+n+1);
    Do(); Do2();
    for(int i=1; i<=m; ++i) printf("%d\n", ans[i]);
    return 0;
}

Compilation message (stderr)

rope.cpp: In function 'void Do()':
rope.cpp:47:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   47 |  for(auto& v:adj) v.clear(); memset(self, 0, sizeof(self)); memset(t, 0, sizeof(t));
      |  ^~~
rope.cpp:47:30: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   47 |  for(auto& v:adj) v.clear(); memset(self, 0, sizeof(self)); memset(t, 0, sizeof(t));
      |                              ^~~~~~
rope.cpp: In function 'void Do2()':
rope.cpp:74:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   74 |  for(auto& v:adj) v.clear(); memset(self, 0, sizeof(self)); memset(t, 0, sizeof(t));
      |  ^~~
rope.cpp:74:30: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   74 |  for(auto& v:adj) v.clear(); memset(self, 0, sizeof(self)); memset(t, 0, sizeof(t));
      |                              ^~~~~~

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