Submission #1268582

#	Time	Username	Problem	Language	Result	Execution time	Memory
1268582		ilovewaguri	Kamenčići (COCI21_kamencici)	C++20	70 / 70	84 ms	175536 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define NAME "KAMENCICI"
#define nl '\n'
#define allofa(x,sz) x,x+sz+1
#define allof(x) x.begin(),x.end()
#define allof1(x) x.begin()+1,x.end()
#define mset(x,val) memset(x,val,sizeof(x))
#define couf(x) cout << fixed << setprecision(x)
template<class T> T Abs(T &x) {return (x>=0 ? x : -x);};
template<class X,class Y> bool minimize(X &a, Y b){if(a>b) {a=b;return true;}return false;};
template<class X,class Y> bool maximize(X &a, Y b){if(a<b) {a=b;return true;}return false;};
typedef long long ll;
const ll mod = (long long)1e9+7;
const ll LINF = (long long)1e15;
const int INF = (int)1e9;
const int MAXN = (int)355;
int dp[MAXN][MAXN][MAXN]; //dp[l][r][take];
char a[MAXN];
int pref[MAXN];
int redP;
int n,k;

void ccps() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    if(fopen(NAME".inp","r")) {
        freopen(NAME".inp","r",stdin);
        freopen(NAME".out","w",stdout);
    }
}

bool sol(int l, int r, int take) {
    if(dp[l][r][take]!=-1) return dp[l][r][take];
    int notTake = pref[r]-pref[l-1];
    int ot = redP - notTake - take;
    if(take>=k) dp[l][r][take]=false;
    else if(ot>=k) dp[l][r][take]=true;
    else {
        if(!sol(l+1,r,ot) or !sol(l,r-1,ot)) dp[l][r][take]=true;
        else dp[l][r][take]=false;
    }
    return dp[l][r][take];
}

signed main() {
    ccps();
    cin >> n >> k;
    for (int i = 1; i<=n; i++) {
        cin >> a[i];
    }
    for (int i = 1; i<=n; i++) {
        pref[i]=pref[i-1]+(a[i]=='C');
    }
    redP=pref[n];
    mset(dp,-1);
    cout << (sol(1,n,0) ? "DA" : "NE");
}

Compilation message (stderr)

Main.cpp: In function 'void ccps()':
Main.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen(NAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen(NAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 40 / 40