Submission #104278

#	Time	Username	Problem	Language	Result	Execution time	Memory
104278		janchomath	Fish (IOI08_fish)	C++14	0 / 100	950 ms	23384 KiB

fish

#include<bits/stdc++.h>
#define ll long long
#define f first
#define s second
#define pb push_back
using namespace std;
ll n,k,m,dp[500005],sum[500005],last[500005],ans,cur,raod[500005];
pair<ll,ll>a[500005];
ll pw(ll a,ll b){
	ll xar = a;
	ll ans = 1;
	while(b>0){
 		if(b%2==1)ans=(ans*xar)%m;
 		b/=2;
 		xar=(xar*xar)%m;
	}
	return ans%m;
}
int main(){
    cin >> n >> k >> m;
    
    for(int i=1; i<=n; i++){
        cin >> a[i].f >> a[i].s;
    }
    
    sort(a+1,a+n+1);
    cur = 1LL;
    for(int i=1; i<=n; i++){
        ll l = 1,r = i - 1,mid,ind = 0;
        while(r >= l){
            mid = (l + r) / 2;
            if(2 * a[mid].f <= a[i].f){
                l = mid + 1;
                ind = mid;
            }
            else {
                r = mid - 1;
            }
        }
        raod[a[i].s]++;
        cur = cur * pw(raod[a[i].s],m - 2LL);
        cur %= m;
        dp[i] = cur - sum[a[i].s];
        dp[i] += m;
        dp[i] %= m;
        ans += dp[i];
        ans %= m;
        sum[a[i].s] += dp[i];
        sum[a[i].s] %= m;
        cur *= (raod[a[i].s] + 1LL);
        cur %= m;
    }
    
    cout << ans << endl;
    
    
    return 0;
}

Compilation message (stderr)

fish.cpp: In function 'int main()':
fish.cpp:29:32: warning: variable 'ind' set but not used [-Wunused-but-set-variable]
         ll l = 1,r = i - 1,mid,ind = 0;
                                ^~~

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