Submission #502967

#	Time	Username	Problem	Language	Result	Execution time	Memory
502967		doowey	Gap (APIO16_gap)	C++14	100 / 100	52 ms	3216 KiB

gap

#include <bits/stdc++.h>
#include "gap.h"

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair

long long findGap(int T, int N){
    if(T == 1){
        ll low = -1, high = (ll)1e18 + 1;
        vector<ll> C(N);
        int L = 0, R = N - 1;
        for(int i = 0 ; i < (N + 1) / 2; i ++ ){
            MinMax(low + 1, high - 1, &low, &high);
            C[L] = low;
            C[R] = high;
            L ++ ;
            R -- ;
        }
        ll res = 0;
        for(int i = 1; i < N; i ++ ){
            res = max(res, C[i] - C[i - 1]);
        }
        return res;
    }
    ll low=0, high=0;
    ll lim = (ll)1e18;
    MinMax(0ll, lim, &low, &high);
    ll S = (high - low + (N - 1) - 1) / (N - 1); // the gap is atleast S
    ll gl = low + 1;
    ll gr;
    vector<ll> in;
    in.push_back(low);
    if(N >= 3){
        ll ca, cb;
        while(gl <= high){
            gr = min(high - 1, gl + S);
            MinMax(gl, gr, &ca, &cb);
            gl += S + 1;
            if(ca == -1) continue;
            in.push_back(ca);
            in.push_back(cb);
        }
    }
    in.push_back(high);
    ll res = 0;
    for(int i = 1; i < in.size(); i ++ ){
        res = max(res, in[i] - in[i - 1]);
    }
	return res;
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for(int i = 1; i < in.size(); i ++ ){
      |                    ~~^~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 70 / 70