oj.uz

Submission #986433

# Submission time Handle Problem Language Result Execution time Memory
986433 2024-05-20T14:01:03 Z Zero_OP Watching (JOI13_watching) C++14
100 / 100
 63 ms 16472 KB 
#include<bits/stdc++.h>

using namespace std;
using int64 = int64_t;

#define  FOR(i, l, r) for(int i = (l), _r = (r); i <= _r; ++i)
#define FORD(i, r, l) for(int i = (r), _l = (l); i >= _l; --i)
#define  rep(i, l, r) for(int i = (l), _r = (r); i < _r; ++i)
#define repd(i, r, l) for(int i = (r) - 1, _l = l; i >= _l; --i)
#define          left __left
#define         right __right
#define          next __next
#define          prev __prev
#define           div __div
#define            pb push_back
#define            pf push_front
#define        all(v) v.begin(), v.end()
#define         sz(v) (int)v.size()
#define    compact(v) v.erase(unique(all(v)), end(v))
#define        dbg(v) "[" #v " = " << (v) << "]"
#define    file(name) if(fopen(name".inp", "r")) {freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }

template<typename T>
    bool minimize(T& a, const T& b){
        if(a > b) return a = b, true;
        return false;
    }

template<typename T>
    bool maximize(T& a, const T& b){
        if(a < b) return a = b, true;
        return false;
    }

template<int dimension, typename T>
struct vec : public vector<vec<dimension - 1, T>> {
    static_assert(dimension > 0, "Dimension must be positive !\n");
    template<typename... Args>
    vec(int n = 0, Args... args) : vector<vec<dimension - 1, T>> (n, vec<dimension - 1, T>(args...)) {}
};

template<typename T>
struct vec<1, T> : public vector<T> {
    vec(int n = 0, T val = T()) : vector<T>(n, val) {}
};

void preprocess();
void init();
void process();

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    file("antuvu");
    preprocess();

    int T = 1; //cin >> T;
    while(T--){
        init();
        process();
    }

    return 0;
}

const int MAX = 2e3 + 5;

int n, p, q, a[MAX], reach_w[MAX], reach_2w[MAX], dp[MAX][MAX];

void preprocess(){

}

void init(){
    cin >> n >> p >> q;
    for(int i = 1; i <= n; ++i){
        cin >> a[i];
    }
}

bool f(int w){
    for(int i = 1, j = 1, k = 1; i <= n; ++i){
        while(j < n && a[j + 1] - a[i] + 1 <= w){
            ++j;
        }

        reach_w[i] = j;

        while(k < n && a[k + 1] - a[i] + 1 <= 2 * w){
            ++k;
        }

        reach_2w[i] = k;
    }

    if(reach_w[1] == n || reach_2w[1] == n) return true;

    memset(dp, -1, sizeof(dp));
    dp[0][1] = reach_2w[1];
    dp[1][0] = reach_w[1];

    for(int i = 0; i <= p; ++i){
        for(int j = 0; j <= q; ++j) if(i || j){
            if(dp[i][j] == n){
                return true;
            }

            dp[i + 1][j] = max(dp[i + 1][j], reach_w[dp[i][j] + 1]);
            dp[i][j + 1] = max(dp[i][j + 1], reach_2w[dp[i][j] + 1]);
        }
    }

    return false;
}

void process(){
    if(p + q >= n){
        cout << 1 << '\n';
        return;
    }

    sort(a + 1, a + 1 + n);

    int l = 1, r = 1e9, ans = r;
    while(l <= r){
        int mid = l + r >> 1;
        if(f(mid)) ans = mid, r = mid - 1;
        else l = mid + 1;
    }
    cout << ans << '\n';
}

Compilation message

watching.cpp: In function 'void process()':
watching.cpp:127:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  127 |         int mid = l + r >> 1;
      |                   ~~^~~
watching.cpp: In function 'int main()':
watching.cpp:21:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 | #define    file(name) if(fopen(name".inp", "r")) {freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:55:5: note: in expansion of macro 'file'
   55 |     file("antuvu");
      |     ^~~~
watching.cpp:21:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 | #define    file(name) if(fopen(name".inp", "r")) {freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:55:5: note: in expansion of macro 'file'
   55 |     file("antuvu");
      |     ^~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 15964 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 22 ms 16200 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 22 ms 16204 KB Output is correct
8 Correct 26 ms 16336 KB Output is correct
9 Correct 23 ms 15964 KB Output is correct
10 Correct 22 ms 15964 KB Output is correct
11 Correct 30 ms 15964 KB Output is correct
12 Correct 24 ms 15964 KB Output is correct
13 Correct 14 ms 15960 KB Output is correct
14 Correct 14 ms 16076 KB Output is correct
15 Correct 20 ms 15960 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 16472 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 30 ms 16220 KB Output is correct
8 Correct 30 ms 16220 KB Output is correct
9 Correct 31 ms 16220 KB Output is correct
10 Correct 33 ms 16216 KB Output is correct
11 Correct 27 ms 16220 KB Output is correct
12 Correct 63 ms 16220 KB Output is correct
13 Correct 20 ms 16220 KB Output is correct
14 Correct 21 ms 16220 KB Output is correct
15 Correct 22 ms 16220 KB Output is correct