Submission #343164

#	Time	Username	Problem	Language	Result	Execution time	Memory
343164		jjwdi0	Gap (APIO16_gap)	C++11	100 / 100	67 ms	3484 KiB

gap

#include "gap.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll solve1(int N) {
    int x = (N + 1) / 2;
    vector<ll> v;
    ll s = 0, e = 1e18, mn, mx;
    for(int i=0; i<x; i++) {
        MinMax(s, e, &mn, &mx);
        v.push_back(mn);
        if(mn != mx) v.push_back(mx);
        s = mn + 1, e = mx - 1;
    }
    sort(v.begin(), v.end());
    ll ans = 0;
    for(int i=1; i<N; i++) {
        ans = max(ans, v[i] - v[i-1]);
    }
    return ans;
}

ll solve2(int N) {
    ll s = 0, e = 1e18, mn, mx;
    MinMax(s, e, &mn, &mx);
    s = mn, e = mx;
    ll T = (e - s + N - 2) / (N - 1);
    vector<ll> v;
    ll l = s, r = s + T;
    for(int i=1; i<N; i++) {
        MinMax(l, r, &mn, &mx);
        if(mn != -1) v.push_back(mn), v.push_back(mx);
        l += T + 1, r += T + 1;
    }
    ll ans = 0;
    for(int i=1; i<v.size(); i++) {
        ans = max(ans, v[i] - v[i-1]);
    }
    return ans;
}

ll findGap(int T, int N) {
    if(T == 1) return solve1(N);
    return solve2(N);
}

Compilation message (stderr)

gap.cpp: In function 'll solve2(int)':
gap.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for(int i=1; i<v.size(); i++) {
      |                  ~^~~~~~~~~

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