Submission #1213779

#	Time	Username	Problem	Language	Result	Execution time	Memory
1213779		sitingfake	Sails (IOI07_sails)	C++20	20 / 100	1092 ms	1352 KiB

sails

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

// define

#define execute cerr << " Time: " << fixed << setprecision(6) << (1.0 * clock() / CLOCKS_PER_SEC) << "s\n";
#define ll long long
#define ld double
#define ii pair<int,int>
#define se second
#define fi first
#define iii pair<int,ii>
#define all(v) v.begin(),v.end()
#define bit(x,i) (((x)>>(i))&1LL)
#define flip(x,i) ((x)^(1LL<<(i)))
#define ms(d,x) memset(d,x,sizeof(d))
#define sitingfake 1
#define orz 1

//constant

const ll mod = 1e9 + 7;
const long long linf = 4557430888798830399;
const int inf = 1061109567;
const int maxarr = 1e6 + 5;
const int dx[] = {0,1,-1,0};
const int dy[] = {1,0,0,-1};

template<typename T> bool maximize(T &a, const T &b)
{
    if(a < b) {a = b; return 1;}
    return 0;
}

template<typename T> bool minimize(T &a, const T &b)
{
    if(a > b) {a = b; return 1;}
    return 0;
}

inline void Plus(ll & a ,ll b)
{
    b %= mod;
    a += b;
    if(a >= mod) a -= mod;
    if(a < 0) a += mod;
    return;
}

inline void Mul(ll & a, ll b)
{
    a %= mod; b %= mod;
    a *= b;
    a %= mod;
    return;
}

//code

const int maxn = 1e5 + 7;

const int Lim = 1e5;

ii a[maxn];

int bit[maxn];

int n;


void up(int x , int val)
{
    for(; x <= Lim ; x += (x & -x))
    {
        bit[x] += val;
    }
}

int get(int x)
{

    int ans = 0;

    for(;x > 0 ; x -= (x & -x))
    {
        ans += bit[x];
    }

    return ans;
}

int search(int x , int val)
{
    int l = 1 , r = x , ans = x + 1;

    while(l <= r)
    {
        int mid = (r + l) >> 1;
        if(get(mid) < val)
        {
            ans = mid;
            r = mid - 1;
        }
        else l = mid + 1;
    }

    return ans;
}

void solve(void)
{
    cin >> n;

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

    sort(a + 1, a + n + 1);

    for(int i = 1; i <= n ; i++)
    {
        int val = get(a[i].fi - a[i].se);

        int l = search(a[i].fi , val);
        up(l , 1);
        up(a[i].fi + 1 , -1);

        int L = search(a[i].fi , val + 1);
        up(L , 1);
        up(L + a[i].se - (a[i].fi - l + 1) , -1);
    }

    ll ans = 0;
    for(int i = 1; i <= a[n].fi ; i++)
    {
        ll val = get(i);
        ans += (val * (val - 1)) / 2;
    }

    cout << ans;
}
/**
**/
signed main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);
   cout.tie(0);

   #define task ""

   if(fopen(task".inp","r"))
   {
       freopen(task".inp","r",stdin);
       freopen(task".out","w",stdout);
   }

   int tc; tc = 1;

   while(tc--) solve();

   //execute;
}

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:155:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  155 |        freopen(task".inp","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
sails.cpp:156:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  156 |        freopen(task".out","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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