1 条题解

  • 1
    @ 2022-8-25 12:03:18
    #include <bits/stdc++.h>
        
    using namespace std;
    const int maxn = 2e5 + 10;
    const int inf = 2e9;
    struct node {
        int v, p;
    } s[maxn];
        
    bool cmp(node x, node y) {
        if (x.v == y.v) return x.p < y.p;
        return x.v < y.v;
    }
        
    int main() {
        int n;
        scanf("%d", &n);
        for (int i = 1; i <= n; i++) {
            scanf("%d", &s[i].v);
            s[i].p = i;
        }
        sort(s + 1, s + n + 1, cmp);
        int ans = 1;
        int f = 1,noww=inf;
        for (int i = 1; i <= n; ) {
            int j = i;
            while (s[j + 1].v == s[j].v && j < n) j++;
            if (f == 1) {
                if(s[j].p<noww) noww=s[i].p;
                else {
                    f=0;
                    noww=s[j].p;
                }
                //if (j == n) ans++;
            } else{
                if(s[i].p>noww) noww=s[j].p;
                else{
                    f=1;
                    ans++;
                    noww=s[i].p;
                }
            }
            i = j+1;
        }
        printf("%d\n", ans);
        return 0;
    }
    
    • 1

    信息

    ID
    45
    时间
    1000ms
    内存
    128MiB
    难度
    1
    标签
    递交数
    52
    已通过
    47
    上传者