백준 21921번 블로그 C++

https://www.acmicpc.net/problem/21921

21921번: 블로그

 

누적 합, 슬라이딩 윈도우

 

#include <iostream>
#include <string>
#include <vector>
#include <math.h>
#include <algorithm>
#include <utility>
#include <stack>
#include <queue>
#include <math.h>
#include <set>
#include <map>
#include <list>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <limits.h>

using namespace std;
using int64 = long long;

int n, x;
vector<int> v;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> n >> x;
    v = vector<int>(n);
    for (int i = 0; i < n; i++) {
        cin >> v[i];
    }
    int maxSum = 0;
    int sum = 0;
    int cnt = 0;
    for (int i = 0; i < x; i++) {
        sum += v[i];
    }
    maxSum = sum;
    cnt = 1;
    for (int i = x; i < n; i++) {
        sum += v[i];
        sum -= v[i - x];
        if (sum > maxSum) {
            maxSum = sum;
            cnt = 1;
        }
        else if (sum == maxSum) {
            cnt++;
        }
    }
    if (maxSum == 0) cout << "SAD";
    else cout << maxSum << "\n" << cnt;
}