제출 #559563

#제출 시각아이디문제언어결과실행 시간메모리
559563Pherokung캥거루 (CEOI16_kangaroo)C++14
0 / 100
1 ms340 KiB
#include<bits/stdc++.h> using namespace std; #define N 2005 #define ll long long const int mod = 1e9+7; int n,cs,cf,del; ll dp[N][N],ans; int main(){ scanf("%d%d%d",&n,&cs,&cf); dp[0][0] = 1; for(int idx=1;idx<=n;idx++){ for(int comp=1;comp<=idx;comp++){ if(idx == cs || idx == cf){ dp[idx][comp] += dp[idx-1][comp]; dp[idx][comp] += dp[idx-1][comp-1]; del++; } else{ // if(comp * 2 - del > 0) dp[idx][comp] += dp[idx-1][comp] * (comp * 2 - del); dp[idx][comp] += dp[idx-1][comp-1] * (comp - del); dp[idx][comp] += dp[idx-1][comp+1] * (comp); } // printf("?? %d %d : %lld\n",idx,comp,dp[idx][comp]); dp[idx][comp] %= mod; } } printf("%lld",dp[n][1]); }

컴파일 시 표준 에러 (stderr) 메시지

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf("%d%d%d",&n,&cs,&cf);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~
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