Submission #442776

#	Time	Username	Problem	Language	Result	Execution time	Memory
442776		cpp219	Miners (IOI07_miners)	C++14	100 / 100	214 ms	113516 KiB

miners

#pragma GCC optimization O2
#pragma GCC optimization "unroll-loop"
#pragma target ("avx2")

#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e5 + 9;
const ll Log2 = 20;
const ll inf = 1e9 + 7;
char c;
ll a[N],n,dp[N][4][4][4][4];

ll f(ll pos,ll have11,ll have12,ll have21,ll have22){
    ll &val = dp[pos][have11][have12][have21][have22];
    if (pos > n) return 0;
    if (val != -1) return val;
    ll ans = 0,now = a[pos],inc1 = 1,inc2 = 1;

    if (now != have11 && have11) inc1++;
    if (now != have12 && have11 != have12 && have12) inc1++;

    if (now != have21 && have21) inc2++;
    if (now != have22 && have21 != have22 && have22) inc2++;

    ans = max(inc1 + f(pos + 1,now,have11,have21,have22),inc2 + f(pos + 1,have11,have12,now,have21));
    return val = ans;
}

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    cin>>n;
    for (ll i = 1;i <= n;i++){
        cin>>c;
        if (c == 'F') a[i] = 1;
        else if (c == 'M') a[i] = 2;
        else a[i] = 3;
    }
    memset(dp,-1,sizeof(dp));
    cout<<f(1,0,0,0,0);
}

Compilation message (stderr)

miners.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization O2
      | 
miners.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
miners.cpp:3: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    3 | #pragma target ("avx2")
      | 
miners.cpp: In function 'int main()':
miners.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• 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