Submission #540638

#	Time	Username	Problem	Language	Result	Execution time	Memory
540638		Vladth11	Miners (IOI07_miners)	C++14	100 / 100	210 ms	616 KiB

miners

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "

using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <long double, pii> muchie;

const ll NMAX = 1000001;
const ll VMAX = 1000001;
const ll INF = (1LL << 60);
const ll MOD = 1000000007;
const ll BLOCK = 1000000;
const ll nr_of_bits = 16;

int dp[2][4][4][4][4];
int f[4];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    string s;
    cin >> s;
    for(int a = 0; a < 4; a++) {
        for(int b = 0; b < 4; b++) {
            for(int c = 0; c < 4; c++) {
                for(int d = 0; d < 4; d++)
                    dp[1][a][b][c][d] = -2e9;
            }
        }
    }
    dp[1][0][0][0][0] = 0;

    int maxim = 0;
    for(int i = 0; i < s.size(); i++) {
        int cod = 0;
        if(s[i] == 'M')
            cod = 1;
        else if(s[i] == 'F')
            cod = 2;
        else
            cod = 3;
        for(int a = 0; a < 4; a++) {
            for(int b = 0; b < 4; b++) {
                for(int c = 0; c < 4; c++) {
                    for(int d = 0; d < 4; d++)
                        dp[i&1][a][b][c][d] = -2e9;
                }
            }
        }
        for(int pf = 0; pf < 4; pf++) {
            for(int ps = 0; ps < 4; ps++) {
                for(int df = 0; df < 4; df++) {
                    for(int ds = 0; ds < 4; ds++) {
                        f[pf]++;
                        f[cod]++;
                        f[ps]++;
                        int addition = 0;
                        for(int j = 0; j < 4; j++) {
                            addition += (j > 0 && f[j] > 0);
                            f[j] = 0;
                        }
                        addition = max(addition, 0);
                        dp[i&1][ps][cod][df][ds] = max(dp[i&1][ps][cod][df][ds], dp[!(i&1)][pf][ps][df][ds] + addition);
                        maxim = max(maxim, dp[i&1][ps][cod][df][ds]);
                        f[df]++;
                        f[cod]++;
                        f[ds]++;
                        addition = 0;
                        for(int j = 0; j < 4; j++) {
                            addition += (j > 0 && f[j] > 0);
                            f[j] = 0;
                        }
                        addition = max(addition, 0);
                        dp[i&1][pf][ps][ds][cod] = max(dp[i&1][pf][ps][ds][cod], dp[!(i&1)][pf][ps][df][ds] + addition);
                        maxim = max(maxim, dp[i&1][pf][ps][ds][cod]);
                    }
                }
            }
        }

    }
    cout << maxim;
    return 0;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:40:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     for(int i = 0; i < s.size(); i++) {
      |                    ~~^~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8