Submission #1111698

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111698		Matkap	Sails (IOI07_sails)	C++14	0 / 100	1071 ms	2640 KiB

sails

/*
    Author:Matkap(prefix_sum)
*/

#include <bits/stdc++.h>
#include <array>

using namespace std;

#define int long long
#define endl "\n"
#define ar array
#define all(x) x.begin(),x.end()

const int INF = 1e17 , MOD = 1e9 + 7;

void setIO(string name = "") 
{
    if (name.size())
    {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}
int mul(int a,int b,int mod = MOD)
{
    a %= mod;
    b %= mod;
    return a * 1LL * b % mod;
}
int sum(int a,int b,int mod = MOD)
{
    a %= mod;
    b %= mod;
    return (a + b + mod) % mod;
}
int binpow(int base,int power,int mod = MOD)
{
    if(power == 1) return base;
    if(power == 0) return 1;
    
    if(power%2==1)
    {
         int a;    
         a = binpow(base,(power - 1)/2);
        return mul(base, mul(a, a, mod), mod);
    } 
    else
     {
        int a;
        a = binpow(base,power/2);
        return mul(a, a, mod);
    } 

}
int inv(int a,int mod = MOD)
{
    a %= mod;
    return binpow(a, mod - 2) % mod;
}
const int mxH = 1e5 + 7;
set<ar<int,2>> st;
int tree[mxH];
void upd(int l, int r)
{
    for(++l;mxH > l;l++) tree[l]++;
    for(++r;mxH > r;r++) tree[r]--;
}
int q(int pos)
{
    return tree[pos];
}
void solve()
{
    int n;
    cin >> n;
    ar<int,2> a[n];
    for(int i = 0;n > i;i++) cin >> a[i][0] >> a[i][1];
    sort(a,a + n);
    int cur_height = 0;
    for(int i = 0;n > i;i++)
    {
        if(cur_height + a[i][1] > a[i][0])
        {
            upd(cur_height, a[i][0]);
            a[i][1] -= a[i][0] - cur_height;
            upd(0LL, a[i][1]);
            cur_height = a[i][1];
        }
        else
        {
            upd(cur_height, cur_height + a[i][1]);
            cur_height += a[i][1];
        }
    }
    int ans = 0;
    for(int i = 1;mxH > i;i++)
    {
        ans += (q(i) * (q(i) - 1)) / 2;
    }
    cout << ans << endl;
}
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int tt;
    tt=1; 
    //cin >> tt;
    while(tt--) solve();

}

Compilation message (stderr)

sails.cpp: In function 'void setIO(std::string)':
sails.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sails.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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