Submission #21999

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
219992017-04-28 17:02:04gs14004흑백 (kriii4_G)C++11
100 / 100
366 ms33284 KiB
#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef pair<int, int> pi;
const int mod = 1e9 + 7;
lint ipow(lint x, lint p){
lint ret = 1, piv = x % mod;
while(p){
if(p&1) ret *= piv;
piv *= piv;
ret %= mod;
piv %= mod;
p >>= 1;
}
return ret % mod;
}
lint pwr[2000005], ipw[2000005];
lint fact[1005], invf[1005];
int n, m;
lint ncr(int x, int y){
if(y < 0 || x < y) return 0;
return fact[x] * (invf[y] * invf[x-y] % mod) % mod;
}
lint solve(int n, int m){
lint ans = 0;
for(int i=1; i<=n; i++){
 
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