Submission #719844

#	Time	Username	Problem	Language	Result	Execution time	Memory
719844		n0sk1ll	Plus Minus (BOI17_plusminus)	C++14	0 / 100	1 ms	212 KiB

plusminus

#include <bits/stdc++.h>

#define FAST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);cerr.tie(0)
#define mp make_pair
#define xx first
#define yy second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define all(x) x.begin(),x.end()
#define ff(i,a,b) for (int i = a; i < b; i++)
#define fff(i,a,b) for (int i = a; i <= b; i++)
#define bff(i,a,b) for (int i = b-1; i >= a; i--)
#define bfff(i,a,b) for (int i = b; i >= a; i--)

using namespace std;
long double typedef ld;
unsigned int typedef ui;
long long int typedef li;
pair<int,int> typedef pii;
pair<li,li> typedef pli;
pair<ld,ld> typedef pld;
vector<vector<int>> typedef graph;
unsigned long long int typedef ull;
//const int mod = 998244353;
const int mod = 1000000007;







//Note to self: Check for overflow

int power(int a, int n)
{
    li c=1;
    while (n)
    {
        if (n&1) (c*=a)%=mod;
        a=(li)a*a%mod,n>>=1;
    }
    return c;
}

bool nemozerow=false;
bool nemozecol=false;
map<int,bool> row;
map<int,bool> col;

int main()
{
    FAST;

    int n,m,k; cin>>n>>m>>k;
    while (k--)
    {
        char signe;
        int y,x; cin>>signe>>y>>x;
        bool booligne=(signe=='+')^(y&1)^(x&1);
        if (row.count(y) && booligne!=row[y]) nemozerow=true;
        if (col.count(x) && booligne!=col[x]) nemozecol=true;
        row[y]=booligne,col[x]=booligne;
    }

    if (nemozerow && nemozecol) return cout<<0,0;

    int ans=0;
    if (!nemozerow)
    {
        (ans+=power(2,n-(int)row.size()))%=mod;
        bool isparan=false,isneparan=false;
        for (auto it : row) if ((it.xx&1)^it.yy) isparan=true; else isneparan=true;
        if (!isparan || !isneparan) ans--;
    }
    if (!nemozecol)
    {
        (ans+=power(2,m-(int)col.size()))%-mod;
        bool isparan=false,isneparan=false;
    }

    cout<<ans<<"\n";
}

//Note to self: Check for overflow

Compilation message (stderr)

plusminus.cpp: In function 'int main()':
plusminus.cpp:80:42: warning: value computed is not used [-Wunused-value]
   80 |         (ans+=power(2,m-(int)col.size()))%-mod;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
plusminus.cpp:81:14: warning: unused variable 'isparan' [-Wunused-variable]
   81 |         bool isparan=false,isneparan=false;
      |              ^~~~~~~
plusminus.cpp:81:28: warning: unused variable 'isneparan' [-Wunused-variable]
   81 |         bool isparan=false,isneparan=false;
      |                            ^~~~~~~~~

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