Submission #879199

#	Time	Username	Problem	Language	Result	Execution time	Memory
879199		Vovamatrix	Plus Minus (BOI17_plusminus)	C++14	0 / 100	0 ms	348 KiB

plusminus

//https://oj.uz/problem/view/BOI17_plusminus
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define PI acos(-1)
#define LSB(i) ((i) & -(i))
#define ll long long
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define fi first
#define sc second
#define th third
#define fo fourth
#define pii pair<int,int>
#define pll pair<ll,ll>
#define ldb double
#define INF 1e15
#define MOD 1000000007
#define endl "\n"

#define all(data)       data.begin(),data.end()
#define TYPEMAX(type)   std::numeric_limits<type>::max()
#define TYPEMIN(type)   std::numeric_limits<type>::min()
#define MAXK 100007
char s[MAXK];
ll x[MAXK],y[MAXK];
vector<pair<pll,ll>> vx,vy;
ll Pow(ll a,ll b)
{
    if(b==0) return 1;
    ll x=Pow(a,b/2)%MOD; x=(x*x)%MOD;
    if(b&1) x=(x*a)%MOD;
    return x;
}
int main()
{
    ios::sync_with_stdio(false); cin.tie(0);
    ll n,m,k,rez=0; cin>>n>>m>>k;
    for(int i=1;i<=k;i++)
    {
        cin>>s[i]>>y[i]>>x[i];
        if(s[i]=='+') s[i]='1';
        else s[i]='0';
        vx.pb({{x[i],y[i]},i});
        vy.pb({{y[i],x[i]},i});
    }
    sort(all(vx)); sort(all(vy));
    ll cnt=0,cur=0,curpar=-2;
    for(auto p:vy)// svi redovi su +-
    {
        if(p.fi.fi==cur)
        {
            if(curpar==-2) curpar=abs(p.fi.sc%2-(s[p.sc]-'0'));
            else if(curpar!=abs(p.fi.sc%2-(s[p.sc]-'0'))) {cnt=-1; break;}
        }
        else {cnt++; cur=p.fi.fi; curpar=abs(p.fi.sc%2-(s[p.sc]-'0'));};
    }
    if(cnt!=-1) rez=(rez+Pow(2,n-cnt));
    cnt=0; cur=0; curpar=-2;
    for(auto p:vx)// sve kolone su +-
    {
        if(p.fi.fi==cur)
        {
            if(curpar==-2) curpar=abs(p.fi.sc%2-(s[p.sc]-'0'));
            else if(curpar!=abs(p.fi.sc%2-(s[p.sc]-'0'))) {cnt=-1; break;}
        }
        else {cnt++; cur=p.fi.fi; curpar=abs(p.fi.sc%2-(s[p.sc]-'0'));};
    }
    if(cnt!=-1) rez=(rez+Pow(2,m-cnt));
    bool check=true; curpar=-2;
    for(int i=1;i<=k;i++)
    {
        if(curpar==-2) curpar=abs((x[i]+y[i])%2-(s[i]-'0'));
        else if(curpar!=abs((x[i]+y[i])%2-(s[i]-'0'))) {check=false; break;}
    }
    if(check) rez=((rez-1)%MOD+MOD)%MOD;
    cout<<rez<<endl;
    return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 42
• Subtask 3: 0 / 46