Submission #513174

#	Time	Username	Problem	Language	Result	Execution time	Memory
513174		kevin	Sails (IOI07_sails)	C++17	0 / 100	25 ms	10288 KiB

sails

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

#define ll long long
#define nl cout<<"\n"
#define f first
#define s second
#define ca(v) for(auto i:v) cout<<i<<" ";

const int MAXN = 1000000;

ll h[MAXN + 5];

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    if (fopen("input.in", "r")) freopen("input.in", "r", stdin);
    int n; cin>>n;
    for(int i=0; i<n; i++){
        ll H, K; cin>>H>>K;
        h[H-K+1]++;
        h[H+1]--;
    }
    for(int i=1; i<=MAXN; i++){
        h[i] += h[i-1];
    }
    vector<pair<ll, ll>> v;
    for(int i=1; i<=MAXN; i++){
        if(!h[i]) continue;
        if(v.size() == 0){
            if(i == 1) {
                v.push_back({1, h[i]});
                continue;
            }
            v.push_back({i-1, 0});
        }
        if(h[i] < v.back().s) v.push_back({1, h[i]});
        else{
            h[i] -= v.back().s;
            v[v.size()-1].f++;
            while(h[i]){
                if(v.size() == 1 || abs(v.back().s - v[v.size()-2].s) * v.back().f >= h[i]){
                    pair<ll, ll> tmp = v.back();
                    v.pop_back();
                    ll x = h[i] / tmp.f;
                    ll r = h[i] % tmp.f;
                    if(!r) v.push_back({tmp.f, tmp.s + x});
                    else{
                        v.push_back({tmp.f - r, tmp.s + x + 1});
                        v.push_back({r, tmp.s});
                    }
                    h[i] = 0;
                }
                else{
                    h[i] -= abs(v.back().s - v[v.size()-2].s) * v.back().f;
                    v[v.size()-2].f += v.back().f;
                    v.pop_back();
                }
            }
        }
    }
    ll ans = 0;
    for(auto p:v){
        // cout<<p.f<<" "<<p.s<<"\n";
        ans += (ll)p.f * (p.s * (p.s - 1) / 2);
    }
    cout<<ans<<"\n";
}

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:17:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     if (fopen("input.in", "r")) freopen("input.in", "r", stdin);
      |                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 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