Submission #405269

#	Time	Username	Problem	Language	Result	Execution time	Memory
405269		knightron0	Plus Minus (BOI17_plusminus)	C++14	100 / 100	562 ms	39380 KiB

plusminus

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

#define pb push_back
#define fr first
#define sc second
#define clr(a, x) memset(a, x, sizeof(a))
#define dbg(x) cout<<"("<<#x<<"): "<<x<<endl;
#define printvector(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout<<*it<<" "; cout<<endl;
#define all(v) v.begin(), v.end()
#define lcm(a, b) (a * b)/__gcd(a, b)
#define int long long int
#define printvecpairs(vec) for(auto it: vec) cout<<it.fr<<' '<<it.sc<<endl;
#define endl '\n'
#define float long double

const int MOD = 1e9 + 7;
const int INF = 2e15;
const int MAXN = 1e5 + 5;

int fastexpo(int b, int exp){
    if(exp == 0) return 1;
    if(exp == 1) return b;
    int ans = (fastexpo(b,exp/2) % MOD);
    ans *= ans;
    ans %= MOD;
    if(exp % 2 == 1){
        ans *= b;
    }
    ans %= MOD;
    return ans;
}

map<int, vector<int>> rw, cl;
map<pair<int, int>, int> vl;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    #endif
	int n, m, k;
	cin>>n>>m>>k;
	set<int> rws, cls;
	for(int i=0;i<k;i++){
		char c;
		cin>>c;
		int x, y;
		cin>>x>>y;
		rws.insert(x);
		cls.insert(y);
		rw[x].pb(y);
		cl[y].pb(x);
		if(c == '+') {
			vl[{x,y}] = 1;
		}
		if(c == '-') {
			vl[{x,y}] = 0;
		}
	}
	bool rowwise= true;
	int rowleft = n-(int)rws.size();
	for(int i: rws){
		int cnt[2][2];
		cnt[0][0] = cnt[0][1] = cnt[1][1] = cnt[1][0] = 0;
		for(int j: rw[i]){
			if(vl.count({i, j}) > 0) {
				cnt[j&1][vl[{i,j}]]++;
			}
		}
		if((cnt[0][1] == 0 && cnt[1][0] == 0) || (cnt[1][1] == 0 && cnt[0][0] == 0)){
			continue;
		} else {
			rowwise = false;
			break;
		}
	}
	bool colwise= true;
	int colleft = m-(int)cls.size();
	for(int i: cls){
		int cnt[2][2];
		cnt[0][0] = cnt[0][1] = cnt[1][1] = cnt[1][0] = 0;
		for(int j: cl[i]){
			if(vl.count({j, i}) > 0) {
				cnt[j&1][vl[{j,i}]]++;
			}
		}
		if((cnt[0][1] == 0 && cnt[1][0] == 0) || (cnt[1][1] == 0 && cnt[0][0] == 0)){
			continue;
		} else {
			colwise = false;
			break;
		}
	}
	int ans = 0;
	if(rowwise){
		ans += fastexpo(2, rowleft);
		ans %= MOD;
	}
	if(colwise){
		ans += fastexpo(2, colleft);
		ans %= MOD;
	}
	ans %= MOD;
	if(rowwise && colwise){
		ans = (ans-1+MOD)%MOD;
		ans %= MOD;
	}
	if(k == 0){
		ans--;
		ans += MOD;
		ans %= MOD;
	}
	cout<<ans<<endl;
    return 0;
}

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