제출 #824161

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
824161		ajay	Savrsen (COCI17_savrsen)	C++14	0 / 120	44 ms	131072 KiB

savrsen

/* Ajay Jadhav */

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <deque>
#include <vector>
#include <cstdlib>
#include <iomanip>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <stack>
#include <ctime>
#include <string.h>
#include <climits>
#include <cstring>
using namespace std;

#define ll long long
#define pb push_back
#define pii pair<int, int>
#define vi vector<int>
#define vii vector<pii>
#define mi map<int, int>
#define mii map<pii, int>
#define all(a) (a).begin(), (a).end()
#define x first
#define y second
#define sz(x) (int)x.size()
#define hell 1000000007
#define rep(i, a, b) for (int i = a; i < b; i++)
#define endl '\n'

void solve()
{
    int a, b;
    cin >> a >> b;
    ll ans = 0;
    const int N = 1e7;
    vector<ll> pre_sum(N + 1);
    vector<ll> sum(N + 1);
    rep(i, 1, N + 1)
    {
        sum[i] = i;
    }
    for (int i = 1; i <= N / 2; i++)
    {
        for (ll j = 2 * i; j <= N; j += i)
        {
            sum[j] -= i;
        }
    }

    for (int i = 1; i <= N; i++)
    {
        sum[i] = abs(sum[i]);
        sum[i] += sum[i - 1];
    }

    cout << sum[b] - sum[a - 1] << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    // cin>>t;
    while (t--)
    {
        solve();
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

savrsen.cpp: In function 'void solve()':
savrsen.cpp:41:8: warning: unused variable 'ans' [-Wunused-variable]
   41 |     ll ans = 0;
      |        ^~~

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