Submission #569792

#	Time	Username	Problem	Language	Result	Execution time	Memory
569792		aryan12	Painting Walls (APIO20_paint)	C++17	28 / 100	1594 ms	164176 KiB

paint

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

int minimumInstructions(int N, int M, int K, vector<int> colors, vector<int> num, vector<vector<int> > likes) 
{
    vector<vector<int> > dp(N, vector<int> (M, -1e9));
    set<int> likings[M];
    for(int contractor = 0; contractor < M; contractor++)
    {
        for(int j = 0; j < num[contractor]; j++)
        {
            likings[contractor].insert(likes[contractor][j]);
        }
    }
    for(int i = N - 1; i >= 0; i--)
    {
        for(int j = 0; j < M; j++)
        {
            if(likings[j].count(colors[i]))
            {
                if(i == N - 1 || dp[i + 1][(j + 1) % M] == -1e9)
                {
                    dp[i][j] = 1;
                }
                else
                {
                    dp[i][j] = dp[i + 1][(j + 1) % M] + 1;
                }
            }
            // cout << "dp[" << i << "][" << j << "] = " << dp[i][j] << "\n";
        }
        // cout << "\n\n\n\n";
    }
    vector<int> start_pos;
    for(int i = N - M; i >= 0; i--)
    {
        for(int j = 0; j < M; j++)
        {
            if(dp[i][j] >= M)
            {
                start_pos.push_back(i);
                // cout << i << "\n";
                break;
            }
        }
    }
    int ans = 0;
    int min_x = N;
    for(int i = 0; i < start_pos.size(); i++)
    {
        // cout << "start_pos[i] = " << start_pos[i] << ", M = " << M << ", minx = " << min_x << "\n";
        if(start_pos[i] + M - 1 < min_x - 1)
        {
            return -1;
        }
        if(i == start_pos.size() - 1 || start_pos[i + 1] + M - 1 < min_x - 1 || start_pos[i] == 0)
        {
            min_x = start_pos[i];
            ans++;
        }
    }
    if(min_x != 0) return -1;
    return ans;
}

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:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for(int i = 0; i < start_pos.size(); i++)
      |                    ~~^~~~~~~~~~~~~~~~~~
paint.cpp:57:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |         if(i == start_pos.size() - 1 || start_pos[i + 1] + M - 1 < min_x - 1 || start_pos[i] == 0)
      |            ~~^~~~~~~~~~~~~~~~~~~~~~~

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