Submission #825828

#	Time	Username	Problem	Language	Result	Execution time	Memory
825828		nasam	Feast (NOI19_feast)	C++17	100 / 100	85 ms	2652 KiB

feast

#include <bits/stdc++.h>
#define ll long long
#define FOR(i,a,b) for (int i = (a), _b = (b); i <= _b; i++)
#define FOD(i,b,a) for (int i = (b), _a = (a); i >= _a; i--)
#define FORE(i, v) for (__typeof((v).begin()) i = (v).begin(); i != (v).end(); i++)
#define ALL(v) (v).begin(), (v).end()
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(i) (1LL << (i))
#define CNTBIT(x) __builtin_popcount(x)
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define left ___left
#define right ___right
#define pii pair<int, int>
#define pll pair<ll, ll>
#define DEBUG(n, a) FOR (i, 1, n) cout << a[i] << ' '; cout << endl;
#define lob lower_bound // >=
#define upb upper_bound // >
#define endl "\n"
#define NAME "main"

using namespace std;

template<class X, class Y> bool maximize(X &x, Y y){ if (x < y){ x = y; return true; } return false; }
template<class X, class Y> bool minimize(X &x, Y y){ if (x > y){ x = y; return true; } return false; }

#define  gogobruhbruh  ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define  file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }

const int MOD = 1e9 + 7;

void add(int &a, int b){ if ((a += b) >= MOD) a -= MOD; }
int sub(int a, int b){ if ((a -= b) < 0) a += MOD; return a; }
int muti(int a, int b){ return (1LL * a * b) % MOD; }
int Pow(int x, int y){ int res = 1; for (; y; y >>= 1){ if (y & 1) res = muti(res, x); x = muti(x, x); } return res; }

const int MAX = 3e5 + 7;
const ll INF = 1e18 + 5;

int num, lim;
ll pre[MAX], left, right;

#define state pair<ll, int>

void maxx(state &a, state b, ll val, bool ok){
    b.fi += val; b.se += ok;
    if (a.fi < b.fi)
        a = b;
}

state calc(ll cost){
    state Max, res;
    Max = res = {0, 0};
    FOR (i, 1, num){
        maxx(res, Max, pre[i] + cost, 1);
        maxx(Max, res, -pre[i], 0);
    }
    return res;
}

void solve(){
    left = -left; right = 0;
    ll res = 0;
    while (left <= right){
        ll mid = (left + right) >> 1;
        auto[cost, k] = calc(mid);
        if (k <= lim){
            left = mid + 1;
            res = cost - mid * k;
        }else
            right = mid - 1;
    }
    cout << res;
}

void read(){
    cin >> num >> lim;
    ll Min = 0;
    FOR (i, 1, num)
        cin >> pre[i],
        pre[i] += pre[i - 1],
        maximize(left, pre[i] - Min),
        minimize(Min, pre[i]);
}

int main(){
    gogobruhbruh;
    file("main");
    int test = 1;
//    cin >> test;
    while (test--)
        read(),
        solve();
}

Compilation message (stderr)

feast.cpp: In function 'int main()':
feast.cpp:30:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 | #define  file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:90:5: note: in expansion of macro 'file'
   90 |     file("main");
      |     ^~~~
feast.cpp:30:95: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 | #define  file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                                                       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:90:5: note: in expansion of macro 'file'
   90 |     file("main");
      |     ^~~~

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 29 / 29