Submission #3995753

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define lol(i,n) for(int i=0;i<n;i++)
#define chmax(a,b) a=max(a,b);
typedef long long ll;
#define N 200010
class RAQxRMQ {
private:
	ll dat[2 * N], laz[2 * N];
	ll eval(ll k) {
		if (k < N) {
			laz[k * 2] += laz[k];
			laz[k * 2 + 1] += laz[k];
		}
		dat[k] += laz[k],laz[k]=0;
		return dat[k];
	}
public:
	void init() {
		lol(i, 2 * N)dat[i] = -1e17, laz[i] = 0;
	}
	void add(ll l, ll r, ll x) {
		l += N, r += N + 1;
		for (ll a = l, b = r; a < b; a >>= 1, b >>= 1) {
			if (a & 1)laz[a++] += x;
			if (b & 1)laz[--b] += x;
		}
		for (ll a = l, b = r; a + b; a >>= 1, b >>= 1) {
			dat[a / 2] = max(eval(a), eval(a ^ 1));
			dat[b / 2] = max(eval(b), eval(b ^ 1));
		}
	}
	ll maxi(ll l, ll r) {
		l += N, r += N + 1;
		for (ll d = 20; ~d; d--) {
			eval(l >> d); eval(r >> d);
		}
		ll res = -1e18;
		for (ll a = l, b = r; a < b; a >>= 1, b >>= 1) {
			if (a & 1)chmax(res, eval(a++));
			if (b & 1)chmax(res, eval(--b));
		}
		return res;
	}
	void upd(ll i, ll x) {
		ll val = maxi(i, i);
		add(i, i, max(0LL,x-val));
	}
};
ll n, d[N], q;
vector<ll> v[N];
int main() {
	cin >> n;
	lol(i, n)scanf("%lld",&d[i]);
	cin >> q;
	lol(i, q) {
		ll a, b; scanf("%lld%lld", &a, &b); a--;
		v[a].push_back(b);
	}
	RAQxRMQ seg; seg.init();
	seg.upd(0, 0);
	lol(i, n) {
		sort(v[i].begin(), v[i].end());
		for (auto to : v[i]) {
			seg.upd(to, seg.maxi(0, to - 1));
		}
		ll val = (d[i] == 0 ? -1 : +1);
		seg.add(i +1, n+1, val);
	}
	ll ans = -seg.maxi(0, n+1);
	lol(i, n)ans += d[i];
	cout << ans+1 << endl;
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:54:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  lol(i, n)scanf("%lld",&d[i]);
                              ^
./Main.cpp:57:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   ll a, b; scanf("%lld%lld", &a, &b); a--;
                                     ^

Judge Result