Submission #95244

#	Time	Username	Problem	Language	Result	Execution time	Memory
95244		easrui	Miners (IOI07_miners)	C++14	100 / 100	127 ms	668 KiB

miners

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

int dec(int a, int b, int c)
{
    if(a==0){
        if(b==0) return 1;
        if(b==c) return 1;
        return 2;
    }
    if(a==b){
        if(a==c) return 1;
        return 2;
    }
    if(a==c || b==c) return 2;
    return 3;
}

int main()
{
    int D[16][16][2], N, val, a1, a2, b1, b2, ans = 0;
    string S;
    cin >> N >> S;
    for(int i=0; i<16; i++){
        for(int j=0; j<16; j++){
           D[i][j][0] = D[i][j][1] = INT_MIN;
        }
    }
    D[0][0][1] = 0;
    for(int i=0; i<N; i++){
        if(S[i] == 'M') val = 1;
        if(S[i] == 'B') val = 2;
        if(S[i] == 'F') val = 3;
        for(int j=0; j<16; j++){
            for(int k=0; k<16; k++){
                a2 = j%4;
                a1 = j/4;
                b2 = k%4;
                b1 = k/4;
                D[a2*4+val][k][i%2] = max(D[a2*4+val][k][i%2],D[j][k][(i+1)%2] + dec(a1,a2,val));
                D[j][b2*4+val][i%2] = max(D[j][b2*4+val][i%2],D[j][k][(i+1)%2] + dec(b1,b2,val));
            }
        }
    }
    for(int i=0; i<16; i++){
        for(int j=0; j<16; j++){
            ans = max(ans,D[i][j][(N-1)%2]);
        }
    }
    cout << ans;
}
 

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:12:9: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if(a==c) return 1;
         ^~
miners.cpp:21:26: note: 'val' was declared here
     int D[16][16][2], N, val, a1, a2, b1, b2, ans = 0;
                          ^~~

• 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