Submission #21419

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
21419	2017-04-13 19:33:00	gs14004	Quaternion inverse (kriii2_Q)	C++11	4 / 4	316 ms	2412 KiB

Q

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#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef long double llf;
typedef pair<int, int> pi;
int inv[100005], mod;
vector<vector<int>> aug;
vector<int> sol;
void solve(){
  vector<int> basis[4];
  vector<int> sol2 = {0, 0, 0, 0};
  for(int i=0; i<4; i++){
    bool ok = 0;
    for(int j=0; j<4; j++){
      if(aug[i][j]){
        if(basis[j].empty()){
          basis[j] = aug[i];
          sol2[j] = sol[i];
          ok = 1;
          break;
        }
        else{
          int c = mod - 1ll * aug[i][j] * inv[basis[j][j]] % mod;
          for(int k=0; k<4; k++){
            aug[i][k] += 1ll * c * basis[j][k] % mod;
            aug[i][k] %= mod;
          }
 
 
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Compilation message (stderr)

Q.cpp: In function 'int main()':
Q.cpp:74:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d %d",&a,&b,&c,&d);
                                   ^

• Subtask 1: 1 / 1
• Subtask 2: 3 / 3