Submission #375343

#	Time	Username	Problem	Language	Result	Execution time	Memory
375343		astoria	Painting Walls (APIO20_paint)	C++14	0 / 100	1 ms	748 KiB

paint

#include "bits/stdc++.h"
#include "paint.h"
using namespace std;

int minimumInstructions(int N, int M, int K, std::vector<int> C, std::vector<int> A, std::vector<std::vector<int>> B){
	int f[K+5]; //for the colour i, who can do?
	memset(f,-1,sizeof(f));
	for(int i=0; i<M; i++){
		for(int j=0; j<A[i]; j++){
			int col = B[i][j];
			f[col]=i;
		}
	}
	for(int i=0; i<K; i++){
		if(f[i]==-1) return -1;
	}
	
	int lng[N+5];
	memset(lng,-1,sizeof(lng));
	lng[0]=1;
	for(int i=1; i<N; i++){
		lng[i] = 1;
		int cur = f[C[i]];
		int lst = f[C[i-1]];
		int nxt = (lst+1)%M;
		if(nxt==cur) lng[i] += lng[i-1];
	}
	
	int dp[N+5];
	multiset<int> mns; mns.insert(0);
	for(int i=0; i<N; i++){
		if(lng[i]<M) dp[i]=1e9;
		else dp[i]=(*mns.begin())+1;
		mns.insert(dp[i]);
		if(mns.size()>M&&i>=M) mns.erase(mns.find(dp[i-M]));
		else if(mns.size()>M) mns.erase(0);
	}
	if(dp[N-1]>=1e6) return -1;
	return dp[N-1];
}

Compilation message (stderr)

paint.cpp: In function 'int minimumInstructions(int, int, int, std::vector<int>, std::vector<int>, std::vector<std::vector<int> >)':
paint.cpp:35:16: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |   if(mns.size()>M&&i>=M) mns.erase(mns.find(dp[i-M]));
      |      ~~~~~~~~~~^~
paint.cpp:36:21: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |   else if(mns.size()>M) mns.erase(0);
      |           ~~~~~~~~~~^~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 15
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 37