Submission #1351086

#TimeUsernameProblemLanguageResultExecution timeMemory
1351086dex111222333444555Money (IZhO17_money)C++20
0 / 100
2 ms4164 KiB
#include <bits/stdc++.h>
#define ii pair<int, int>
#define fi first
#define se second
#define siz(v) ((int)(v).size())
#define all(v) begin((v)), end(v)
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(i) (1LL << (i))
#define TIME (1.0 * clock() / CLOCKS_PER_SEC)
#define dbg(x) "[" #x " = " << x << "]"
#define lli pair<long long, int>
using namespace std;
const int MAXN = 2e5 + 5, MAXK = 4, infINT = 5e6, mod = 998244353, MAXV = 1e6 + 6;

bool M1;
const int dx[4] = {-1, 0, 0, 1};
const int dy[4] = {0, -1, 1, 0};

template<class X, class Y> bool minimize(X &x, const Y &y){return x > y ? x = y, 1: 0;}
template<class X, class Y> bool maximize(X &x, const Y &y){return x < y ? x = y, 1: 0;}

void add(int &a, const int &b){
    a += b;
    if (a >= mod) a -= mod;
}

void sub(int &a, const int &b){
    a -= b;
    if (a < 0) a += mod;
}

int mul(const int &a, const int &b){
    return 1LL * a * 1LL * b % mod;
}

int bin_pow(int a, int k){
    int res = 1;
    while(k){
        if (k & 1) res = mul(res, a);
        k >>= 1; a = mul(a, a);
    }
    return res;
}

struct fenwickTree{
    int n;
    vector<int > bit;

    fenwickTree(int _n = 0): n(_n){
        bit.assign(n + 1, MAXV);
    }

    void update(int pos, const int &v){
        for(; pos > 0; pos ^= pos & -pos) bit[pos] = min(bit[pos], v);
    }

    int get(int pos){
        int mi = MAXV;
        for(; pos <= n; pos += pos & -pos) mi = min(bit[pos], mi);
        return mi;
    }
};

int numVal, val[MAXN];

void input(){
    cin >> numVal;
    for(int i = 1; i <= numVal; i++) cin >> val[i];
}

void solve(){
    fenwickTree bit(MAXV);

    int cur = 1, res = 0;
    while(cur <= numVal){
        int nxt = cur + 1;
        while(nxt <= numVal && val[nxt] >= val[nxt - 1] && bit.get(val[cur]) > val[nxt]){
            nxt++;
        }
        res++;
        bit.update(val[nxt - 1], val[nxt - 1]);
        cur = nxt;
    }
    cout << res << '\n';
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int t = 1;
    // cin >> t;
    while(t--){
        input();
        solve();
    }
    cerr << TIME << ".s\n";
}

Compilation message (stderr)

money.cpp: In function 'int main()':
money.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
money.cpp:92:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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