题面传送门

贪心

#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;

int a[50000];

int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];
    sort(a, a + n);
    int ans = 0;
    for (int i = 0; i < n-1; i++)
        if (a[i+1]-1 >= a[i]) continue;
        else {
            ans = ans + a[i] - a[i+1] + 1;
            a[i+1] = a[i] + 1;
        }
    cout << ans << endl;
    return 0;
} 

原文地址：https://www.cnblogs.com/baoyihan/p/11068518.html