Submission #998050

#	Time	Username	Problem	Language	Result	Execution time	Memory
998050		khanhtb	Examination (JOI19_examination)	C++17	100 / 100	328 ms	40052 KiB

examination

#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld double
#define pb push_back
#define pf push_front
#define vi vector<ll>
#define vii vector<vi>
#define pll pair<ll,ll>
#define vpll vector<pll>
#define all(a) a.begin(), a.end()
#define fi first
#define se second
using namespace std;
const ll mod = 1e9+7;   
const ll inf = 2e18;
const ll base = 31;
const ll blocksz = 320;
const ll N = 2e5+8;
ll n,q;
struct point{
    ll x,y,z,id;
} a[N];
struct Binary_Indexed_Tree{
    ll BIT[N]; 
    void update(ll i, ll x){
        while(i <= n+q){
            BIT[i] += x;
            i += (i&-i);
        }
    }
    ll get(ll i){
        ll ans = 0;
        while(i){
            ans += BIT[i];
            i -= (i&-i);
        }
        return ans;
    }
} bit;
ll ans[N];
void cdq(ll l, ll r){
    if(l == r) return;
    ll m = l+r>>1;
    cdq(l,m),cdq(m+1,r);
    vector<point> pts;
    vi reset;
    ll i = l, j = m+1, cnt = 0;
    while(i <= m && j <= r){
        if(a[i].y > a[j].y){
            if(a[i].id <= n) bit.update(a[i].z,1),cnt++,reset.pb(a[i].z);
            pts.pb(a[i++]);
        }
        else{
            if(a[j].id > n) ans[a[j].id] += cnt-bit.get(a[j].z);
            pts.pb(a[j++]);
        }
    }
    while(i <= m){
        if(a[i].id <= n) bit.update(a[i].z,1),cnt++,reset.pb(a[i].z);
        pts.pb(a[i++]);
    }
    while(j <= r){
        if(a[j].id > n) ans[a[j].id] += cnt-bit.get(a[j].z);
        pts.pb(a[j++]);
    }
    for (ll i = l; i <= r; ++i) a[i] = pts[i-l];
    for (ll i:reset) bit.update(i,-1);
}   
map<ll,ll> comp;
void solve(){
    cin >> n >> q;
    vi compress;
    for(ll i = 1; i <= n; i++){
        cin >> a[i].x >> a[i].y;
        a[i].id = i;
        a[i].z = a[i].x+a[i].y;
        compress.pb(a[i].z);
    }
    for(ll i = n+1; i <= n+q; i++){
        cin >> a[i].x >> a[i].y >> a[i].z;
        a[i].x--, a[i].y--, a[i].z--;
        a[i].id = i;
        compress.pb(a[i].z);
    }
    sort(all(compress));
    compress.erase(unique(all(compress)),compress.end());
    for(ll i = 1; i <= compress.size(); i++){
        comp[compress[i-1]] = i;
    }
    for(ll i = 1; i <= n+q; i++) a[i].z = comp[a[i].z];
    sort(a+1,a+n+q+1,[&](point x, point y){
        return x.x > y.x || (x.x == y.x && (x.y < y.y || (x.y == y.y && x.z < y.z)));
    });
    cdq(1,n+q);
    for(ll i = n+1; i <= n+q; i++){
        cout << ans[i] << '\n';
    }
}   
signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if(fopen("test.inp","r")){
        freopen("test.inp","r",stdin);
        freopen("test.out","w",stdout);
    }
    ll T = 1;
    // cin >> T;
    while(T--){
        solve();
        cout << '\n';
    }
} 

Compilation message (stderr)

examination.cpp: In function 'void cdq(long long int, long long int)':
examination.cpp:44:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   44 |     ll m = l+r>>1;
      |            ~^~
examination.cpp: In function 'void solve()':
examination.cpp:88:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |     for(ll i = 1; i <= compress.size(); i++){
      |                   ~~^~~~~~~~~~~~~~~~~~
examination.cpp: In function 'int main()':
examination.cpp:103:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |         freopen("test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
examination.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen("test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 20 / 20
• Subtask 3: 21 / 21
• Subtask 4: 57 / 57