Submission #543945

#	Time	Username	Problem	Language	Result	Execution time	Memory
543945		OttoTheDino	Plus Minus (BOI17_plusminus)	C++17	100 / 100	336 ms	30600 KiB

plusminus

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

#define rep(i,s,e)                  for (int i = s; i <= e; ++i)
#define rrep(i,s,e)                 for (int i = s; i >= e; --i)
#define pb                          push_back
#define pf                          push_front
#define fi                          first
#define se                          second
#define all(a)                      a.begin(), a.end()
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<string> vs;
typedef vector<ll> vll;

const ll mod = 1e9+7;

long long bin_exp (long long a, long long x) {
    long long res = 1;
    while (x>0) {
        if (x%2) res = res*a%mod;
        a = a*a%mod;
        x /= 2;
    }
    return res;
}


int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n, m, k; cin >> n >> m >> k;

    if (k==0) {
        cout << (bin_exp(2,n)+bin_exp(2,m)+mod-2)%mod << "\n";
        return 0;
    }

    map<int,int> rowh[2], colh[2];
    set<int> sepr, sepc;

    bool fC = 0, fR = 0;

    while (k--) {
        char x; int r, c; cin >> x >> r >> c;
        sepr.insert(r);
        sepc.insert(c);
        bool b = (x=='+')^(c%2); 
        rowh[b][r] = 1;
        if (rowh[!b][r]) fC = 1; 
        b = (x=='+')^(r%2);
        colh[b][c] = 1;
        if (colh[!b][c]) fR = 1;  
    }

    if (fC && fR) cout << "0\n";
    else if (fC) cout << bin_exp(2, m-sepc.size()) << "\n";
    else if (fR) cout << bin_exp(2, n-sepr.size()) <<"\n";
    else {
        ll res = (bin_exp(2,m-sepc.size()) + bin_exp(2,n-sepr.size()) + mod - 1) % mod;
        cout << res << "\n";
    }

    return 0;
}

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