Submission #51909

#	Time	Username	Problem	Language	Result	Execution time	Memory
51909		rondojim	Last supper (IOI12_supper)	C++17	100 / 100	165 ms	50560 KiB

advisor

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

typedef long long ll;
 
const int MAXN = 1e5 + 5;
vector<bool> used(MAXN, 0);
int nxt[MAXN], pos[MAXN], top[MAXN];
 
struct col{
	int color, next;
	bool operator<(const col &x) const {
		return next < x.next;
	}
};
 
priority_queue<col> pq;
vector<int> work[MAXN];

void ComputeAdvice(int *c, int n, int k, int m){
	for(int i=0; i<n; ++i) pos[i] = -1, nxt[i] = n;
	for(int i=0; i<n; ++i){
		if(pos[c[i]] == -1){
			pos[c[i]] = i;
			if(c[i] < k) pq.push({c[i], i});
		}
		else{
			nxt[pos[c[i]]] = i;
			pos[c[i]] = i;
		}
	}
	for(int i=0; i<n; ++i){
		if(pos[i] == -1){
			if(i < k) pq.push({i, n});
		}
		else nxt[pos[i]] = n;
	}
	for(int i=0; i<k; ++i) used[i] = true;
	for(int i=0; i<n; ++i){
		if(used[c[i]]) work[c[i]].push_back(0);
		else{
			col t = pq.top();
			pq.pop();
			used[t.color] = false;	
			used[c[i]] = true;
			work[t.color].push_back(1);
		}
		pq.push({c[i], nxt[i]});
	}
	for(int i=0; i<n+k; ++i){
		int j = i < k ? i : c[i - k];
		if(top[j] == work[j].size()) WriteAdvice(1);
		else WriteAdvice(work[j][top[j]++]);
	}
}

assistant

#include "assistant.h"
#include <vector>
 
const int MAXN = 2e5 + 5;

std::vector<bool> used(MAXN, false);
int exclude[MAXN], top, bot;

void Assist(unsigned char *advice, int n, int k, int r) {
	for(int i=0; i<k; ++i){
		used[i] = true;
		if(advice[i]) exclude[top++] = i;
	}
	advice += k;
	for(int i=0; i<n; ++i){
		int req = GetRequest();
		if(!used[req]) {
			PutBack(exclude[bot]);
			used[req] = true;
			used[exclude[bot++]] = false;
		}
		if(advice[i]) exclude[top++] = req;
	}
}

Compilation message (stderr)

advisor.cpp: In function 'void ComputeAdvice(int*, int, int, int)':
advisor.cpp:54:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(top[j] == work[j].size()) WriteAdvice(1);
      ~~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 35 / 35
• Subtask 5: 39 / 39