Submission #986599

#	Time	Username	Problem	Language	Result	Execution time	Memory
986599		AverageAmogusEnjoyer	Sails (IOI07_sails)	C++17	25 / 100	20 ms	3164 KiB

sails

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T> bool cmin(T &i,T j) { return i > j ? i = j,true: false; }
template<class T> bool cmax(T &i,T j) { return i < j ? i = j,true: false; }

constexpr int nax = 100100;
ll a[nax];
ll b[nax];
int n;
ll cost;

bool can(ll k) {
    copy(a,a+nax,b);
    cost = 0;
    for (int i=nax-1;i>=1;i--) {
        ll to_do = min(k,b[i]);
        cost += to_do*(to_do-1)/2;
        b[i]-=to_do;
        b[i-1]+=b[i];
    }
    return b[0] == 0LL; 
}

void solve() {
    cin >> n;
    ll sum = 0;
    for (int i=0,h,k;i<n;i++) {
        cin >> h >> k;
        a[h]++;
        a[h-k]--;
        sum += k;
    }
    for (int i=nax-1;i>=1;i--) { a[i-1]+=a[i]; }
    ll lo = 0, hi = sum;
    while(lo < hi) {
        ll mid = lo+(hi-lo)/2;
        if (!can(mid)) {
            lo = mid+1;
        } else {
            hi = mid;
        }
    } 
    assert(can(lo));
    cout << cost << endl;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1;
    while(t--) {
        solve();
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10