제출 #559557

#제출 시각아이디문제언어결과실행 시간메모리
559557Pherokung캥거루 (CEOI16_kangaroo)C++14
0 / 100
1 ms212 KiB
#include<bits/stdc++.h> using namespace std; #define N 1005 #define ll long long const int mod = 1e9+7; int n,cs,cf; ll dp[N][N][3],ans; int main(){ scanf("%d%d%d",&n,&cs,&cf); dp[0][0][0] = 1; for(int idx=1;idx<=n;idx++){ for(int comp=1;comp<=idx;comp++){ for(int ex=0;ex<=2;ex++){ if(idx == cs || idx == cf){ if(ex == 0) continue; dp[idx][comp][ex] += dp[idx-1][comp][ex-1]; dp[idx][comp][ex] += dp[idx-1][comp-1][ex-1]; } else{ dp[idx][comp][ex] += dp[idx-1][comp][ex] * (comp * 2 - ex); dp[idx][comp][ex] += dp[idx-1][comp-1][ex] * (comp - ex); dp[idx][comp][ex] += dp[idx-1][comp+1][ex] * (comp); } dp[idx][comp][ex] %= mod; } } } printf("%lld",dp[n][1][2]); }

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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