Submission #672928

#	Time	Username	Problem	Language	Result	Execution time	Memory
672928		Alihan_8	Simple game (IZhO17_game)	C++17	100 / 100	315 ms	36104 KiB

game

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
const int N = 1e6+1;
int T[N*4], lazy[N*4];
void push(int v, int l, int r){
    if ( !lazy[v] ) return;
    if ( l != r ){
        lazy[v*2] += lazy[v];
        lazy[v*2+1] += lazy[v];
    }
    T[v] += (r-l+1)*lazy[v];
    lazy[v] = 0;
}
void upd(int v, int l, int r, int tl, int tr, int val){
    push(v, l, r);
    if ( l > tr or tl > r ) return;
    if ( tl <= l and tr >= r ){
        lazy[v] += val;
        push(v, l, r);
        return;
    }
    int md = (l+r)>>1;
    upd(v*2, l, md, tl, tr, val), upd(v*2+1, md+1, r, tl, tr, val);
    T[v] = T[v*2]+T[v*2+1];
}
int get(int v, int l, int r, int pos){
    push(v, l, r);
    if ( l == r ) return T[v];
    int md = (l+r)>>1;
    if ( pos <= md ) return get(v*2, l, md, pos);
    return get(v*2+1, md+1, r, pos);
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, q; cin >> n >> q;
    vector <int> p(n);
    for ( auto &i: p ) cin >> i;
    auto modify = [&](int l, int r, int add){
        if ( min(l, r) < 0 or max(l, r) >= n ) return;
        l = p[l], r = p[r];
        if ( l > r ) swap(l, r);
        upd(1, 1, N-1, l, r, add);
    };
    for ( int i = 1; i < n; i++ ) modify(i-1, i, 1);
    while ( q-- ){
        int t; cin >> t;
        if ( t == 1 ){
            int pos, val; cin >> pos >> val;
            pos--;
            modify(pos, pos-1, -1), modify(pos, pos+1, -1);
            p[pos] = val;
            modify(pos, pos-1, 1), modify(pos, pos+1, 1);
        }
        else{
            int x; cin >> x;
            cout << get(1, 1, N-1, x) << ln;
        }
    }

    cout << '\n';
}

Compilation message (stderr)

game.cpp: In function 'void IO(std::string)':
game.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
game.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 27 / 27
• Subtask 3: 51 / 51