제출 #83454

#제출 시각아이디문제언어결과실행 시간메모리
83454tincamateiTents (JOI18_tents)C++14
100 / 100
141 ms36224 KiB
#include <bits/stdc++.h> using namespace std; const int MAX_N = 3000; const int MOD = 1000000007; int dp[1+MAX_N][1+MAX_N]; int main() { #ifdef HOME FILE *fin = fopen("input.in", "r"); FILE *fout = fopen("output.out", "w"); #else FILE *fin = stdin; FILE *fout = stdout; #endif int n, m; fscanf(fin, "%d%d", &n, &m); for(int i = 0; i <= MAX_N; ++i) dp[0][i] = dp[i][0] = 1; for(int i = 1; i <= MAX_N; ++i) for(int j = 1; j <= MAX_N; ++j) { dp[i][j] = ((long long)dp[i - 1][j - 1] * j * 4) % MOD; if(i >= 2) dp[i][j] = ((long long)dp[i - 2][j - 1] * (i - 1) * j + dp[i][j]) % MOD; if(j >= 2) dp[i][j] = ((long long)dp[i - 1][j - 2] * j * (j - 1) / 2 + dp[i][j]) % MOD; dp[i][j] = ((long long)dp[i - 1][j] + dp[i][j]) % MOD; } fprintf(fout, "%d", (dp[n][m] - 1 + MOD) % MOD); #ifdef HOME fclose(fin); fclose(fout); #endif return 0; }

컴파일 시 표준 에러 (stderr) 메시지

tents.cpp: In function 'int main()':
tents.cpp:19:8: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fscanf(fin, "%d%d", &n, &m);
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~
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