Submission #674144

#	Time	Username	Problem	Language	Result	Execution time	Memory
674144		QwertyPi	The grade (info1cup18_thegrade)	C++14	100 / 100	229 ms	11164 KiB

thegrade

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
using namespace std;

const int MOD = 1e9 + 7;
const int MAXN = 1e6 + 11;
int pm(int a, int b){
	return b == 0 ? 1 : pm(a * a % MOD, b / 2) * (b % 2 ? a : 1) % MOD;
}

int mi(int a){
	return pm(a, MOD - 2);
}

map<int, int> M; int s = 0;
int f[MAXN];

int32_t main(){
	f[0] = 1; for(int i = 1; i < MAXN; i++) f[i] = f[i - 1] * i % MOD;
	int q, e; cin >> q >> e; int k = 0;
	int mul = 1;
	for(int i = 0; i < q; i++){
		int t, v; cin >> t >> v;
		if(t == 0){
			M[v]++; s++; e -= v;
			mul = mul * mi(M[v]) % MOD;
		}else{
			mul = mul * M[v] % MOD;
			M[v]--; s--; e += v;
		}
		if(e < 0){
			cout << -1 << endl;
		}else{
			cout << f[s + e] * mul % MOD * mi(f[e]) % MOD << endl;
		}
	}
}

Compilation message (stderr)

thegrade.cpp: In function 'int32_t main()':
thegrade.cpp:22:31: warning: unused variable 'k' [-Wunused-variable]
   22 |  int q, e; cin >> q >> e; int k = 0;
      |                               ^

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 15 / 15
• Subtask 6: 15 / 15
• Subtask 7: 20 / 20