제출 #298405

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
298405		jainbot27	Semiexpress (JOI17_semiexpress)	C++17	100 / 100	30 ms	4596 KiB

semiexpress

#pragma GCC optimize("Ofast")
#pragma GCC target("sse4,avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;

#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ts to_string
#define ub upper_bound
#define lb lower_bound
#define ar array
#define all(x) x.begin(), x.end()
#define siz(x) (int)x.size()
#define FOR(x, y, z) for(int x = (y); x < (z); x++)
#define ROF(x, y, z) for(int x = (y-1); x >= (z); x--)
#define F0R(x, z) FOR(x, 0, z)
#define R0F(x, z) ROF(x, z, 0)
#define trav(x, y) for(auto&x:y)

const string nl = "\n";
using ll = int64_t;
using vi = vector<int>;
using vl = vector<ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using str = string;
using vpii = vector<pii>;
using vpll = vector<pll>;


template<class T> inline bool ckmin(T&a, T b) {return b < a ? a = b, 1 : 0;}
template<class T> inline bool ckmax(T&a, T b) {return b > a ? a = b, 1 : 0;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void usaco(string x=""){
    ios_base::sync_with_stdio(0); cin.tie(0); x=x;
#ifndef D
    if(siz(x)){
        freopen((x+".in").c_str(), "r", stdin);
        freopen((x+".out").c_str(), "w", stdout);
    }
#endif
}


str ts(char c) { return str(1,c); }
str ts(bool b) { return b ? "true" : "false"; }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
template<class A> str ts(complex<A> c) { 
    stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) { 
    str res = "{"; for(int i = 0;i < (int)v.size(); i++) res += char('0'+v[i]);
    res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
    str res = ""; for(int i = 0; i < b.size(); i++) res += char('0'+b[i]);
    return res; }
template<class A, class B> str ts(pair<A,B> p);
template<class T> str ts(T v) { 
    bool fst = 1; str res = "{";
    for (const auto& x: v) {
        if (!fst) res += ", ";
        fst = 0; res += ts(x);
    }
    res += "}"; return res;
}
template<class A, class B> str ts(pair<A,B> p) {
    return "("+ts(p.f)+", "+ts(p.s)+")"; }
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << ts(h); if (sizeof...(t)) cerr << ", ";
    DBG(t...); }


#ifdef D 
#define dbg(...) cerr << "LINE(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif
const int mxN = 3001;
int n, m, k, a, b, c, st[mxN], lst; ll t, ans = 0; vl best;

int main(){
    usaco("");
    cin >> n >> m >> k >> a >> b >> c >> t;
    k-=m;
    F0R(i, m){
        cin >> st[i];
    }
    lst = 0;
    F0R(i, m-1){
        ll tt = (ll)(st[i]-1) * b;
        if(tt > t) break;
        ll amt = min((ll)st[i+1]-st[i], (t-tt)/a + 1);
        ans += amt;
        ll pos = amt + st[i];
        int used = 0;
        while(pos < st[i+1]&&used!=k){
            used ++;
            ll ti =(ll) (pos - st[i]) * c;
            if(ti + tt > t) break;
            amt = min((ll) st[i+1]-pos, ((t-tt-ti)/a + 1));
            best.pb(amt);
            pos = amt + pos;
        }
    }
    sort(all(best), greater<ll>());
    F0R(i, min(k, siz(best))){
        ans += best[i];
    }
    if((ll)(n-1)*b<=t) ans++;
    cout << ans-1 << nl;
}
/*
 * Stuff I should try:
 * Is it Monotonic? -> Binary Search
 * Is N small? -> Bitsets or other exponential
 * Edge Cases? Look Carefully 
 * Can't figure anything out? Brute Force and see patterns
 * Try to prove greedies
 * Prefix Sums, Amortization, DP, Data Structures
*/

컴파일 시 표준 에러 (stderr) 메시지

semiexpress.cpp: In function 'void usaco(std::string)':
semiexpress.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   40 |         freopen((x+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
semiexpress.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   41 |         freopen((x+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 52 / 52