Submission #414326

#	Time	Username	Problem	Language	Result	Execution time	Memory
414326		ACmachine	Painting Walls (APIO20_paint)	C++17	51 / 100	1587 ms	67196 KiB

paint

#include "paint.h"

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

#define FOR(i, j, k, l) for(int i = (j); i < (k); i += (l))
#define FORD(i, j, k, l) for(int i = (j); i>=(k); i -= (l))
#define REP(i, n) FOR(i, 0, n, 1)
#define REPD(i, n) FORD(i, n, 0, 1)
#define pb push_back
typedef long long ll;
const int INF = (int)1e9;
const ll INFF = (ll)1e18;


int minimumInstructions(
    int n, int m, int k, std::vector<int> C, std::vector<int> A, std::vector<std::vector<int>> B) {
    vector<vector<int>> g(k); // which contractors like this color
    REP(i, m){
        for(int x : B[i]){
            g[x].pb(i); // color x is liked by ith contractor too
        }
    }
    vector<vector<int>> starts(m); // for this start as modulo, which ones are okay?
    vector<bool> starts_valid(n, false); // does valid segment start here?
    REP(i, n){
        for(int off : g[C[i]]){
            int start = (off - i);
            start %= m;
            if(start < 0) start += m;
            starts[start].pb(i);
        }
    }
    /*
    REP(i, m){
        for(int x : starts[i]){
            cout << x << " ";
        }
        cout << endl;
    }
    */
    REP(i, m){
        deque<int> dq; // if max - min == m - 1; ok
        if(starts[i].size() < m)
            continue;
        REP(j, m){
            dq.push_back(starts[i][j]);
            if(dq.back() - dq[0] == m - 1){
                starts_valid[dq[0]] = true;
            }
        }
        FOR(j, m, starts[i].size(), 1){
            dq.pop_front();
            dq.push_back(starts[i][j]);
            if(dq.back() - dq[0] == m - 1){
                starts_valid[dq[0]] = true;
            }
        }
    }
    /*
    for(int x : starts_valid){
        cout << x << " ";
    }
    cout << endl;
    */
    // I have all valid starts
    vector<int> dp(n + 1, INF);
    dp[0] = 0;
    FOR(i, m, n + 1, 1){
        if(!starts_valid[i - m])
            continue;
        FOR(j,i - m, i, 1){
            dp[i] = min(dp[i], dp[j] + 1);
        }
    }
    /*
    for(int x : dp){
        cout << x << " ";
    }
    cout << endl;
    */
    if(dp[n] >= INF){
        return -1;
    }
    else{
        return dp[n];
    }
    return 0;
}

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:44:29: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   44 |         if(starts[i].size() < m)
      |            ~~~~~~~~~~~~~~~~~^~~
paint.cpp:6:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 | #define FOR(i, j, k, l) for(int i = (j); i < (k); i += (l))
      |                                            ^
paint.cpp:52:9: note: in expansion of macro 'FOR'
   52 |         FOR(j, m, starts[i].size(), 1){
      |         ^~~

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