제출 #886960

#제출 시각아이디문제언어결과실행 시간메모리
886960AloraMagneti (COCI21_magneti)C++17
110 / 110
93 ms12688 KiB
#include <bits/stdc++.h> #define Alora "cownav" #define fi(i,a,b) for(int i = a; i <= b; i++) #define fid(i,a,b) for(int i = a; i >= b; i--) #define ll long long #define f first #define se second #define pii pair<int, int> #define getbit(i, j) ((i >> j) & 1) #define all(v) v.begin(), v.end() #define pb push_back #define maxn 10088 const int M = 1e9 + 7; using namespace std; int n, l, r[55]; ll res, C[55][maxn], gt[55], dp[2][55][maxn]; void add(ll &x, ll y){x = (x + y) % M;} ll mul(ll x, ll y) {return x*y % M;} void pre(){ fi(i, 1, l + n) C[0][i] = 1; C[1][1] = 1; fi(i, 2, l + n){ fi(j, 1, min(50, i)){ add(C[j][i], C[j][i - 1] + C[j - 1][i - 1]); } } gt[0] = 1; fi(i, 1, n) gt[i] = 1ll*gt[i - 1]*i % M; } void sub1(){ if(n == 1) {cout << l; exit(0);} int len = l - (1 + r[1]*(n - 1)); if(len < 0){cout << 0; exit(0);} len += n; cout << C[n][len]*gt[n] % M; exit(0); } int main(){ ios_base::sync_with_stdio(0); cin.tie(NULL); if(fopen(Alora".inp", "r")){ freopen(Alora".inp", "r", stdin); freopen(Alora".out", "w", stdout);} cin >> n >> l; pre(); fi(i, 1, n) cin >> r[i]; sort(r + 1, r + n + 1); if(r[1] == r[n]) sub1(); dp[0][0][0] = 1; int t = 0; fi(i, 1, n){ t ^= 1; dp[t][0][0] = 0; fi(j, 1, i){ fi(d, 1, l){ dp[t][j][d] = dp[1 - t][j - 1][d - 1]; // add new if(d >= r[i]) add(dp[t][j][d], mul(dp[1 - t][j][d - r[i]], 2*j)); // add if(d >= 2*r[i] - 1) add(dp[t][j][d], mul(dp[1 - t][j + 1][d - 2*r[i] + 1], (j + 1)*j)); // connect } } } fi(d, 1, l) add(res, mul(dp[t][1][d], C[n][l - d + n])); cout << res; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen(Alora".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     freopen(Alora".out", "w", stdout);}
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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