Submission #525302

#	Time	Username	Problem	Language	Result	Execution time	Memory
525302		AA_Surely	Divide and conquer (IZhO14_divide)	C++14	0 / 100	0 ms	324 KiB

divide

#include <bits/stdc++.h>

#define FOR(i,x,n) 	for(int i=x; i<n; i++)
#define F0R(i,n) 	FOR(i,0,n)
#define ROF(i,x,n) 	for(int i=n-1; i>=x; i--)
#define R0F(i,n) 	ROF(i,0,n)

#define WTF 		cout << "WTF" << endl

#define IOS 		ios::sync_with_stdio(false); cin.tie(0)
#define F 			first
#define S	 		second
#define pb 			push_back

#define ALL(x) 		x.begin(), x.end()
#define RALL(x) 	x.rbegin(), x.rend()

using namespace std;
typedef long long 		LL;

typedef pair<int, int> 	PII;
typedef pair<LL, LL> 	PLL;

typedef vector<int> 	VI;
typedef vector<LL> 		VLL;
typedef vector<PII> 	VPII;
typedef vector<PLL> 	VPLL;

const int MAXN = 2e5 + 7;
const int ALPHA = 27;
const LL INF = 1e16 + 7;
const int MOD = 1e9 + 7;
const int LOG = 22;

struct Mine {
    LL pt, gd, eg;
} ns[MAXN];

int n;

int solve(int l, int r) {
    if (l == r) return ns[l].gd;
    int mid = (l + r) >> 1;

    LL ret = max(solve(l, mid), solve(mid + 1, r));
    //cout << "solving for : " << l << ' ' << r << endl;

    VPLL lf, rt;

    LL gsum = 0, esum = 0;
    ROF(i, l, mid + 1) {
        gsum += ns[i].gd;
        esum += ns[i].eg;

        lf.pb({esum - (ns[mid].pt - ns[i].pt), gsum});
    }
    
    gsum = 0, esum = 0;
    FOR(i, mid + 1, r + 1) {
        gsum += ns[i].gd;
        esum += ns[i].eg;

        rt.pb({esum - (ns[i].pt - ns[mid].pt), gsum});
    }
    
    /*
    for(auto [id, val] : lf) cout << "(" << id << ", " << val << ") ";
    cout << endl;
    for(auto [id, val] : rt) cout << "(" << id << ", " << val << ") ";
    cout << endl;
    */

    sort(ALL(lf));
    sort(RALL(rt));
    
    LL lmx = 0, rmx = -INF, rptr = 0;
    for(auto [weight, gold] : lf) {
        lmx = max(lmx, (LL)gold);
        
        while(rptr < rt.size() && weight + rt[rptr].F >= 0) {
            rmx = max(rmx, rt[rptr].S);
            rptr++;
        }

        ret = max(ret, lmx + rmx);
    }

    return ret;
}

int main() {
    IOS;
    
    cin >> n;
    F0R(i, n) cin >> ns[i].pt >> ns[i].gd >> ns[i].eg;
    cout << solve(0, n - 1);
}

Compilation message (stderr)

divide.cpp: In function 'int solve(int, int)':
divide.cpp:77:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   77 |     for(auto [weight, gold] : lf) {
      |              ^
divide.cpp:80:20: warning: comparison of integer expressions of different signedness: 'LL' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |         while(rptr < rt.size() && weight + rt[rptr].F >= 0) {
      |               ~~~~~^~~~~~~~~~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 31
• Subtask 3: 0 / 52