#include "bits/stdc++.h" using namespace std; #define rep(i,a,b) for(int i=(a); i<(b); ++i) #define all(x) x.begin(),x.end() #define sz(x) int(x.size()) typedef long long ll; typedef unsigned long long ull; typedef vector<int> vi; typedef vector<vi> vvi; ll p, half; ll mul(ll a, ll b){ return a*b%p; } ll number(ll a, ll b, ll c){ ll ans = mul(mul(a-c+b-1, c-b+a), half); ans += mul(c-a+1, a); ans %= p; return ans; } typedef int I; int lis(const vector<I>& S) { if (S.empty()) return {}; vi prev(sz(S)); typedef pair<I, int> p; vector<p> res; rep(i,0,sz(S)) { // change 0 -> i for longest non-decreasing subsequence auto it = lower_bound(all(res), p{S[i], 0}); if (it == res.end()) res.emplace_back(), it = res.end()-1; *it = {S[i], i}; prev[i] = it == res.begin() ? 0 : (it-1)->second; } int L = sz(res); return L; } ll brute(int a, int b, int c){ int n = number(a,b,c); assert(n<14); vi ord(n); iota(all(ord),0); int cnt = 0; do{ vi up(n); rep(i,0,n){ up[i] = 1; rep(j,0,i) if (ord[j] < ord[i]){ up[i] = max(up[i], up[j] + 1); } } vi down(n); for(int i = n-1; i >=0; --i){ down[i] = 1; for(int j = i+1; j < n; ++j) if (ord[j] < ord[i]){ down[i] = max(down[i], down[j] + 1); } } int mxa=0, mxb=0, mxc=0; rep(i,0,n){ mxa = max(mxa, up[i]); mxb = max(mxb, down[i]); mxc = max(mxc, up[i] + down[i] - 1); } cnt += mxa == a and mxb == b and mxc == c; }while(next_permutation(all(ord))); return cnt; } ll modpow(ll a, ll e){ ll ans = 1; while(e){ if (e&1) ans = mul(ans,a); a = mul(a,a); e/=2; }return ans; } ll fact(ll n){ ll ans = 1; for(int i = 1; i <=n; ++i){ ans = mul(ans,i); } return ans; } ll ndimCat(ll dim, ll n){ if (dim==1) return 1; ll top = 1; ll ft = 1; rep(i,2,dim+1){ top = mul(top,ft); ft = mul(ft, i); } top = mul(top, fact(dim*n)); ll bot = 1; ft = fact(n); rep(i,n+1,n+dim+1){ bot = mul(bot,ft); ft = mul(ft,i); } ll ans = mul(top, modpow(bot, p-2)); return ans; } ll count(ll a, ll b){ ll ans = ndimCat(a, b); ans = mul(ans,ans); return ans; } int main(){ cin.tie(NULL),cin.sync_with_stdio(false); ll a,b,c; cin >> a >> b >> c >> p; if (p<0) p = 1e9+7; half = (p+1)/2; cout << number(a,b,c) << ' ' << count(a,b) << '\n'; } /* 1 smth -> altijd 1 2 2 -> 4 = 2^2 2 3 -> 25 = 5^2 2 4 -> 196 = 14^2 2 5 -> 1764 = 42^2 2 smth -> catalan(b)^2 3 3 -> 1764 = 42^2 3 4 3 smth -> 3d catalan numbers ^ 2 -> seems to be catalan(2*a + b)^2 */
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | #include "bits/stdc++.h" using namespace std; #define rep(i,a,b) for(int i=(a); i<(b); ++i) #define all(x) x.begin(),x.end() #define sz(x) int(x.size()) typedef long long ll; typedef unsigned long long ull; typedef vector<int> vi; typedef vector<vi> vvi; ll p, half; ll mul(ll a, ll b){ return a*b%p; } ll number(ll a, ll b, ll c){ ll ans = mul(mul(a-c+b-1, c-b+a), half); ans += mul(c-a+1, a); ans %= p; return ans; } typedef int I; int lis(const vector<I>& S) { if (S.empty()) return {}; vi prev(sz(S)); typedef pair<I, int> p; vector<p> res; rep(i,0,sz(S)) { // change 0 -> i for longest non-decreasing subsequence auto it = lower_bound(all(res), p{S[i], 0}); if (it == res.end()) res.emplace_back(), it = res.end()-1; *it = {S[i], i}; prev[i] = it == res.begin() ? 0 : (it-1)->second; } int L = sz(res); return L; } ll brute(int a, int b, int c){ int n = number(a,b,c); assert(n<14); vi ord(n); iota(all(ord),0); int cnt = 0; do{ vi up(n); rep(i,0,n){ up[i] = 1; rep(j,0,i) if (ord[j] < ord[i]){ up[i] = max(up[i], up[j] + 1); } } vi down(n); for(int i = n-1; i >=0; --i){ down[i] = 1; for(int j = i+1; j < n; ++j) if (ord[j] < ord[i]){ down[i] = max(down[i], down[j] + 1); } } int mxa=0, mxb=0, mxc=0; rep(i,0,n){ mxa = max(mxa, up[i]); mxb = max(mxb, down[i]); mxc = max(mxc, up[i] + down[i] - 1); } cnt += mxa == a and mxb == b and mxc == c; }while(next_permutation(all(ord))); return cnt; } ll modpow(ll a, ll e){ ll ans = 1; while(e){ if (e&1) ans = mul(ans,a); a = mul(a,a); e/=2; }return ans; } ll fact(ll n){ ll ans = 1; for(int i = 1; i <=n; ++i){ ans = mul(ans,i); } return ans; } ll ndimCat(ll dim, ll n){ if (dim==1) return 1; ll top = 1; ll ft = 1; rep(i,2,dim+1){ top = mul(top,ft); ft = mul(ft, i); } top = mul(top, fact(dim*n)); ll bot = 1; ft = fact(n); rep(i,n+1,n+dim+1){ bot = mul(bot,ft); ft = mul(ft,i); } ll ans = mul(top, modpow(bot, p-2)); return ans; } ll count(ll a, ll b){ ll ans = ndimCat(a, b); ans = mul(ans,ans); return ans; } int main(){ cin.tie(NULL),cin.sync_with_stdio(false); ll a,b,c; cin >> a >> b >> c >> p; if (p<0) p = 1e9+7; half = (p+1)/2; cout << number(a,b,c) << ' ' << count(a,b) << '\n'; } /* 1 smth -> altijd 1 2 2 -> 4 = 2^2 2 3 -> 25 = 5^2 2 4 -> 196 = 14^2 2 5 -> 1764 = 42^2 2 smth -> catalan(b)^2 3 3 -> 1764 = 42^2 3 4 3 smth -> 3d catalan numbers ^ 2 -> seems to be catalan(2*a + b)^2 */ |