Submission #1006114

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006114		crafticat	Tortoise (CEOI21_tortoise)	C++17	0 / 100	1 ms	456 KiB

tortoise

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using pi = pair<int,int>;
using pl = pair<ll,ll>;

#define temp(T) template<class T>
temp(T) using V = vector<T>;
using vi = V<int>;
using vl = V<ll>;
using vvi = V<vi>;
using vpi = V<pi>;
using vb = V<bool>;

#define sz(x) x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert
#define pb push_back
#define eb emplace_back

#define lb lower_bound
#define ub upper_bound

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)

using str = string;

const int MOD = 1e9 + 7;
const ll BIG = 1e18;
const int INF = 1e9 + 2;

temp(T) bool ckmin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0; } // set a = min(a,b)
temp(T) bool ckmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0; } // set a = max(a,b)

void unsyncIO() { cin.tie(0)->sync_with_stdio(0); }
// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void setIO(str s = "") {
    unsyncIO();
    if (sz(s)) setIn(s+".in"), setOut(s+".out"); // for USACO
}

#define read(x) int x; cin >> x;

temp(T) void pr(T x) {
    cout << to_string(x);
}
temp(T) void prln(T x) {
    cout << to_string(x) << "\n";
}


vi readV(int n) {
    vi input(n);
    F0R(i,n)
        cin >> input[i];
    return input;
}

int rand(int a, int b) {
    return a + rand() % (b - a + 1);
}

#define gen(x,a,b) int x = rand(a,b)

vi genArr(int n, int a, int b) {
    vi generated(n);
    F0R(i,n) {
        generated[i] = rand(a,b);
    }
    return generated;
}

vvi genTree(int n) {
    vvi g(n + 1);
    F0R(i,n) {
        gen(p,0,i);
        g[p].pb(i + 1);
        g[i + 1].pb(p);
    }

    return g;
}

int countSum(vi arr) {
    int ans = 0;
    F0R(i,sz(arr))
        ans += arr[i];
    return ans;
}

void computeNearest(vi &arr, vi &nearest) {
    int l = -1;
    F0R(i,sz(arr)) {
        if (arr[i] == -1) l = i;
        if (arr[i] > 0 && l != -1) ckmin(nearest[i], i - l);
    }
    l = -1;
    R0F(i,sz(arr)) {
        if (arr[i] == -1) l = i;
        if (arr[i] > 0 && l != -1) ckmin(nearest[i], l - i);
    }
}

int main() {
    setIO();

    read(n);
    vi arr = readV(n);
    int sum = 0;
    F0R(i, sz(arr))
        if (arr[i] > 0) sum += arr[i];
    vi nearest(n,INF);
    computeNearest(arr,nearest);

    int l = -1;
    int ans = 0;
    vi bonus(n,-1);
    F0R(i,n) {
        if (arr[i] > 0) l = i;
        if (arr[i] == -1) {
            if (l != -1) {
                arr[l]--;
                bonus[i] = (l) * 2 + (i - l);
            }
            l = -1;
        }
    }

    int MAX_TIME = 2 * n + 1;
    vvi dp(n + 1,vi(MAX_TIME,-INF));
    dp[0][0] = 0;

    FOR(i,1,n + 1) {
        FOR(t,1,MAX_TIME) {
            dp[i][t] = dp[i - 1][t - 1];
        }
        if (i == 1) dp[i] = dp[i - 1];

        if (arr[i - 1] != -1) {
            FOR(t,0,MAX_TIME) {
                int time = nearest[i - 1] * 2;
                FOR(k,0,arr[i - 1] + 1) {
                    int takeTime = k == 0 ? t : t - time;
                    if (t - time * k - 1 < 0) continue;
                    if (takeTime > (i - 1) * 2) continue;
                    ckmax(dp[i][t], dp[i - 1][t - time * k - 1] + k);
                }
            }
        }

        FOR(t,1,MAX_TIME) {
            if (t <= bonus[i - 1]) dp[i][t]++;
        }
    }

    int results = 0;
    F0R(i,2 * (n) + 1) {
        ckmax(results, dp[n][i]);
    }
    prln(sum - (results + ans));

    return 0;
}

Compilation message (stderr)

tortoise.cpp: In function 'int countSum(vi)':
tortoise.cpp:29:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 | #define FOR(i,a,b) for (int i = (a); i < (b); ++i)
      |                                        ^
tortoise.cpp:30:18: note: in expansion of macro 'FOR'
   30 | #define F0R(i,a) FOR(i,0,a)
      |                  ^~~
tortoise.cpp:100:5: note: in expansion of macro 'F0R'
  100 |     F0R(i,sz(arr))
      |     ^~~
tortoise.cpp: In function 'void computeNearest(vi&, vi&)':
tortoise.cpp:29:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 | #define FOR(i,a,b) for (int i = (a); i < (b); ++i)
      |                                        ^
tortoise.cpp:30:18: note: in expansion of macro 'FOR'
   30 | #define F0R(i,a) FOR(i,0,a)
      |                  ^~~
tortoise.cpp:107:5: note: in expansion of macro 'F0R'
  107 |     F0R(i,sz(arr)) {
      |     ^~~
tortoise.cpp: In function 'int main()':
tortoise.cpp:29:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 | #define FOR(i,a,b) for (int i = (a); i < (b); ++i)
      |                                        ^
tortoise.cpp:30:18: note: in expansion of macro 'FOR'
   30 | #define F0R(i,a) FOR(i,0,a)
      |                  ^~~
tortoise.cpp:124:5: note: in expansion of macro 'F0R'
  124 |     F0R(i, sz(arr))
      |     ^~~
tortoise.cpp: In function 'void setIn(str)':
tortoise.cpp:49:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 | void setIn(str s) { freopen(s.c_str(),"r",stdin); }
      |                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
tortoise.cpp: In function 'void setOut(str)':
tortoise.cpp:50:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 | void setOut(str s) { freopen(s.c_str(),"w",stdout); }
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 25
• Subtask 5: 0 / 27