Submission #1303528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1303528		nanaseyuzuki	Money (IZhO17_money)	C++20	0 / 100	1 ms	572 KiB

money

#include <bits/stdc++.h>
// Kazusa_Megumi
#define ll long long
#define fi first
#define se second
#define pii pair<int, int>
#define all(a) a.begin(), a.end()
using namespace std;

const int mn = 1e6 + 5, mod = 1e9 + 7, inf = 2e9;

int n, a[mn];

int bit[mn];

void add(int u, int val){
	while(u <= n){
		bit[u] += val;
		u += (u & -u);
	}
}

int get(int u){
	int res = 0;
	while(u){
		res += bit[u];
		u -= (u & -u);
	}
	return res;
}

void solve() {
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> a[i];

    int ptr = 1, res = 1;
    for(int i = 2; i <= n; i++){
    	if(a[i - 1] > a[i] || get(a[i]) - get(a[ptr] - 1) > 0){
    		while(ptr < i){
    			add(a[ptr], 1);
    			ptr ++;
    		}
    		res ++;
    	}
    }
    cout << res << '\n';
}

main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    if (fopen("Kazuki.INP", "r")) {
        freopen("Kazuki.INP", "r", stdin);
        freopen("Kazuki.OUT", "w", stdout);
    }
    int t = 1;
    // cin >> t;
    while (t--) solve();
    return 0;
}

Compilation message (stderr)

money.cpp:49:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   49 | main() {
      | ^~~~
money.cpp: In function 'int main()':
money.cpp:53:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         freopen("Kazuki.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
money.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen("Kazuki.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55