樱花 混合背包

樱花

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <set>
#include <queue>
#include <map>
#include <sstream>
#include <cstdio>
#include <cstring>
#include <numeric>
#include <cmath>
#include <iomanip>
#include <deque>
#include <bitset>
#include <cassert>
//#include <unordered_set>
//#include <unordered_map>
#define ll              long long
#define pii             pair<int, int>
#define rep(i,a,b)      for(int  i=a;i<=b;i++)
#define dec(i,a,b)      for(int  i=a;i>=b;i--)
#define forn(i, n)      for(int i = 0; i < int(n); i++)
using namespace std;
int dir[4][2] = { { 1,0 },{ 0,1 } ,{ 0,-1 },{ -1,0 } };
const long long INF = 0x7f7f7f7f7f7f7f7f;
const int inf = 0x3f3f3f3f;
const double pi = acos(-1.0);
const double eps = 1e-6;
const ll mod = 1e9 + 7;

inline ll read()
{
    ll x = 0; bool f = true; char c = getchar();
    while (c < '0' || c > '9') { if (c == '-') f = false; c = getchar(); }
    while (c >= '0' && c <= '9') x = (x << 1) + (x << 3) + (c ^ 48), c = getchar();
    return f ? x : -x;
}
inline ll gcd(ll m, ll n)
{
    return n == 0 ? m : gcd(n, m % n);
}
void exgcd(ll A, ll B, ll& x, ll& y)
{
    if (B) exgcd(B, A % B, y, x), y -= A / B * x; else x = 1, y = 0;
}
inline int qpow(int x, ll n) {
    int r = 1;
    while (n > 0) {
        if (n & 1) r = 1ll * r * x % mod;
        n >>= 1; x = 1ll * x * x % mod;
    }
    return r;
}
inline int inv(int x) {
    return qpow(x, mod - 2);
}
ll lcm(ll a, ll b)
{
    return a * b / gcd(a, b);
}

/**********************************************************/
const int N = 1e4 + 5;
int t0[N], c[N], p[N], dp[N];
int t, t1, t2, n;

void completepack(int cost, int weight)
{
    rep(i, 0, t)
    {
        if (i >= cost)
            dp[i] = max(dp[i], dp[i - cost] + weight);
    }
}

void zopack(int cost, int weight)
{
    dec(i, t, 0)
    {
        if(i>=cost)
            dp[i] = max(dp[i], dp[i - cost] + weight);
    }
}

void multipack(int cost, int weight, int amount)
{
    if (cost * amount >= t)
    {
        completepack(cost, weight);
        return;
    }
    int k = 1;
    while (k < amount)
    {
        zopack(k * cost, k * weight);
        amount -= k;
        k *= 2;
    }
    zopack(amount * cost, amount * weight);
}

int tonum(string s)
{
    int h = 0;
    int pos = 0;
    for (pos = 0; s[pos] != ':'; pos++)
    {
        h = h * 10 + s[pos] - '0';
    }
    pos++;
    int m = 0;
    for (; pos < s.size(); pos++)
    {
        m = m * 10 + s[pos] - '0';
    }
    return h * 60 + m;
}

int main()
{
#ifdef _DEBUG
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    string s1, s2;
    cin >> s1 >> s2 >> n;
    t1 = tonum(s1);
    t2 = tonum(s2);
    t = t2 - t1;
    rep(i, 1, n)
    {
        cin >> t0[i] >> c[i] >> p[i];
    }
    rep(i, 1, n)
    {
        if (p[i] == 0)
            completepack(t0[i], c[i]);
        else
            multipack(t0[i], c[i], p[i]);
    }
    cout << dp[t] << endl;
    return 0;
}