Submission #583835

#	Time	Username	Problem	Language	Result	Execution time	Memory
583835		BackNoob	Sails (IOI07_sails)	C++14	100 / 100	117 ms	2236 KiB

sails

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define endl '\n'
#define MASK(i) (1LL << (i))
#define ull unsigned long long
#define ld long double
#define pb push_back
#define all(x) (x).begin() , (x).end()
#define BIT(x , i) ((x >> (i)) & 1)
#define TASK "task"
#define sz(s) (int) (s).size()
 
using namespace std;
const int mxN = 1e6 + 227;
const int inf = 1e9 + 277;
const int mod = 1e9 + 7;
const ll infll = 1e18 + 7;
const int base = 307;
const int LOG = 20;
 
template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}


int n;
pair<int, int> a[mxN];
int cnt[mxN];
int bit[mxN];
int N = 2e5;


void update(int pos, int val)
{
	for(; pos <= N; pos += pos & -pos) bit[pos] += val;
}
void update_range(int l, int r, int val)
{
	if(l > r) return;
	// cout << l << ' ' << r << endl;
	update(l, val);
	update(r + 1, -val);
}
int getval(int pos)
{
	int res = 0;
	for(; pos > 0; pos -= pos & -pos) res += bit[pos];
	return res;
}
int findpos(int r, int x)
{
	int lo = 1, hi = r;
	while(lo + 1 < hi) {
		int mid = (lo + hi) / 2;
		if(getval(mid) > x) lo = mid;
		else hi = mid;
	}
	if(getval(lo) == x) return lo;
	return hi;
}

void solve()
{
	cin >> n;

	int maxhigh = -1;
	for(int i = 1; i <= n; i++) {
		cin >> a[i].fi >> a[i].se;
		maximize(maxhigh, a[i].fi);
	}

	sort(a + 1, a + 1 + n);
	for(int i = 1; i <= n; i++) {
		// for(int j = 1; j <= n; j++) cout << getval(j) << ' ';
		// cout << endl;
		int need = a[i].se;
		int lim = a[i].fi;
		int cnt = 0;
		while(need > 0) {
			++cnt;
			int pos = findpos(lim, getval(lim));
			if(lim - pos + 1 >= need) {
				update_range(pos, pos + need - 1, 1);
				need = 0;
			}
			else {
				need -= (lim - pos + 1);
				update_range(pos, lim, 1);
				lim = pos - 1;
				int x = getval(lim - need + 1);		
				int pos1 = findpos(lim, x);
				int pos2 = findpos(lim, x - 1);
				if(getval(pos2) <= x - 1) {
					need -= (lim - pos2 + 1);
					update_range(pos2 , lim , 1);
				}
				update_range(pos1, pos1 + need - 1, 1);
				need = 0;
			}
			lim = pos - 1;
		}
		// cout << a[i].fi << ' ' << a[i].se << ' ' << pos << endl;
		// if(a[i].fi - pos + 1 >= a[i].se) {
		// 	update_range(pos, pos + a[i].se - 1, 1);
		// }
		// else {
		// 	update_range(pos, a[i].fi, 1);
		// 	need -= (a[i].fi - pos + 1);
		// 	// pos = findpos(pos - 1);
		// 	update_range(1, need, 1);
		// }
	}
	// for(int j = 1; j <= n; j++) cout << getval(j) << ' ';
	// cout << endl;

	ll res = 0;
	for(int i = 1; i <= maxhigh; i++) {
		int x = getval(i);
		res += 1LL * x * (x - 1) / 2;
	}
	cout << res;
}
 
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen(TASK".inp" , "r" , stdin);
    //freopen(TASK".out" , "w" , stdout);
 
    int tc = 1;
    //cin >> tc;
    while(tc--) {
    	solve();
    }
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10