Submission #1066891

#	Time	Username	Problem	Language	Result	Execution time	Memory
1066891		KasymK	Miners (IOI07_miners)	C++17	100 / 100	73 ms	1112 KiB

miners

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
int dp[2][4][4][4][4];

int main(){
    int n;
    scanf("%d", &n);
    int a[n];
    string s;
    cin >> s;
    for(int i = 0; i < n; ++i){
        if(s[i] == 'M')
            a[i] = 1;
        else if(s[i] == 'B')
            a[i] = 2;
        else
            a[i] = 3;
    }
    for(int x = n-1; x >= 0; --x)
        for(int a1 = 0; a1 <= 3; ++a1)
            for(int a2 = 0; a2 <= 3; ++a2)
                for(int b1 = 0; b1 <= 3; ++b1)
                    for(int b2 = 0; b2 <= 3; ++b2){
                        int o = 0, o1 = 0, o2 = 0;
                        o = (a1 == 1 or a2 == 1 or a[x] == 1 ? 1 : 0);
                        o1 = (a1 == 2 or a2 == 2 or a[x] == 2 ? 1 : 0);
                        o2 = (a1 == 3 or a2 == 3 or a[x] == 3 ? 1 : 0);
                        int m1 = o+o1+o2;
                        o = 0, o1 = 0, o2 = 0;
                        o = (b1 == 1 or b2 == 1 or a[x] == 1 ? 1 : 0);
                        o1 = (b1 == 2 or b2 == 2 or a[x] == 2 ? 1 : 0);
                        o2 = (b1 == 3 or b2 == 3 or a[x] == 3 ? 1 : 0);
                        int m2 = o+o1+o2;
                        dp[x&1][a1][a2][b1][b2] = max(dp[(x+1)&1][a[x]][a1][b1][b2]+m1, 
                                                        dp[(x+1)&1][a1][a2][a[x]][b1]+m2);
                    }
    int answer = dp[0][0][0][0][0];
    printf("%d\n", answer);
    return 0;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~

• 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