Submission #1107087

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107087		koukirocks	Plus Minus (BOI17_plusminus)	C++17	100 / 100	99 ms	11080 KiB

plusminus

#include <bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0); cin.tie(0)
#define all(x) (x).begin(),(x).end()
#define F first
#define S second
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx,avx2")
//#pragma GCC target("popcnt")
 
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
 
const ll MAX=2e5+10,P=1e9+7;
const ll INF=0x3f3f3f3f,oo=0x3f3f3f3f3f3f3f3f;
const ldb eps=1e-6;
const ldb PI=acos(-1.0);
const int dir[4][2]={{0,1},{0,-1},{1,0},{-1,0}};
template<typename T>
using vvector = vector<vector<T>>;

ll pw(ll a,ll b) {
    ll ans=1,now=a;
    while (b) {
        if (b&1) {
            ans*=now;
            ans%=P;
        }
        now*=now;
        now%=P;
        b>>=1;
    }
    return ans;
}

int main() {
    speed;
    int n,m,k;
    cin>>n>>m>>k;
    map<int,bool> r,c;
    int pr=1,pc=1;
    for (int i=0;i<k;i++) {
        char ch;
        int x,y;
        cin>>ch>>x>>y;
        bool pos=(ch=='+');
        if (r.find(x)!=r.end()) {
            if (r[x]!=(y&1^pos)) pr=0;
        } else r[x]=y&1^pos;
        if (c.find(y)!=c.end()) {
            if (c[y]!=(x&1^pos)) pc=0;
        } else c[y]=x&1^pos;
    }
    // cout<<pw(2,n-r.size())<<" "<<pw(2,m-c.size())<<" "<<pr*pc%P<<"\n";
    if (k) cout<<(pw(2,n-r.size())*pr+pw(2,m-c.size())*pc-pr*pc)%P<<"\n";
    else cout<<(pw(2,n)+pw(2,m)-2)%P<<"\n";
    return 0;
}

Compilation message (stderr)

plusminus.cpp: In function 'int main()':
plusminus.cpp:52:25: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   52 |             if (r[x]!=(y&1^pos)) pr=0;
      |                        ~^~
plusminus.cpp:53:22: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   53 |         } else r[x]=y&1^pos;
      |                     ~^~
plusminus.cpp:55:25: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   55 |             if (c[y]!=(x&1^pos)) pc=0;
      |                        ~^~
plusminus.cpp:56:22: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   56 |         } else c[y]=x&1^pos;
      |                     ~^~

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