Submission #1351239

#	Time	Username	Problem	Language	Result	Execution time	Memory
1351239		dex111222333444555	Money (IZhO17_money)	C++20	100 / 100	75 ms	8244 KiB

money

#include <bits/stdc++.h>
#define all(v) begin(v), end(v)
#define ii pair<int, int>
#define fi first
#define se second
#define siz(v) (int)(v).size()
#define lli pair<long long, int>
#define dbg(x) "[" #x " = " << x << "]"
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(i) (1LL << (i))

using namespace std;

const int mod = 1e9 + 7, infINT = 1e9 + 1321;

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;}

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

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

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

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

const int MAXN = 1e6 + 6;

int numVal, val[MAXN];

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

void solve(){
    int res = 0;
    fenwickTree bit(MAXN);

    int cur = 1;
    while(cur <= numVal){
        int nxt = cur + 1;
        while(nxt <= numVal && val[nxt - 1] <= val[nxt] && bit.get(val[cur] + 1) >= val[nxt]) nxt++;
        for(int i = cur; i < nxt; i++) bit.update(val[i], val[i]);
        cur = nxt;
        res++;
    }

    cout << res << '\n';
}

signed 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);
    }
    input();
    solve();
}

Compilation message (stderr)

money.cpp: In function 'int main()':
money.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
money.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55