Compilare: In function 'void multiply(long long int (*)[2], long long int (*)[2])', inlined from 'void solve()' at main.cpp:48:23, inlined from 'int main(int, char**)' at main.cpp:30:10: main.cpp:62:25: warning: 'mat' may be used uninitialized [-Wmaybe-uninitialized] 62 | mat[i][j] += (1LL * a[i][k] * b[k][j]) % MOD; | ~~~~~~~~^ main.cpp: In function 'int main(int, char**)': main.cpp:58:13: note: 'mat' declared here 58 | int mat[2][2]; | ^~~ In function 'void multiply(long long int (*)[2], long long int (*)[2])', inlined from 'void solve()' at main.cpp:48:23, inlined from 'int main(int, char**)' at main.cpp:30:10: main.cpp:62:25: warning: 'mat' may be used uninitialized [-Wmaybe-uninitialized] 62 | mat[i][j] += (1LL * a[i][k] * b[k][j]) % MOD; | ~~~~~~~~^ main.cpp: In function 'int main(int, char**)': main.cpp:58:13: note: 'mat' declared here 58 | int mat[2][2]; | ^~~ In function 'void multiply(long long int (*)[2], long long int (*)[2])', inlined from 'void solve()' at main.cpp:48:23, inlined from 'int main(int, char**)' at main.cpp:30:10: main.cpp:62:25: warning: 'mat' may be used uninitialized [-Wmaybe-uninitialized] 62 | mat[i][j] += (1LL * a[i][k] * b[k][j]) % MOD; | ~~~~~~~~^ main.cpp: In function 'int main(int, char**)': main.cpp:58:13: note: 'mat' declared here 58 | int mat[2][2]; | ^~~ In function 'void multiply(long long int (*)[2], long long int (*)[2])', inlined from 'void solve()' at main.cpp:48:23, inlined from 'int main(int, char**)' at main.cpp:30:10: main.cpp:62:25: warning: 'mat' may be used uninitialized [-Wmaybe-uninitialized] 62 | mat[i][j] += (1LL * a[i][k] * b[k][j]) % MOD; | ~~~~~~~~^ main.cpp: In function 'int main(int, char**)': main.cpp:58:13: note: 'mat' declared here 58 | int mat[2][2]; | ^~~ In function 'void multiply(long long int (*)[2], long long int (*)[2])', inlined from 'void solve()' at main.cpp:49:19, inlined from 'int main(int, char**)' at main.cpp:30:10: main.cpp:62:25: warning: 'mat' may be used uninitialized [-Wmaybe-uninitialized] 62 | mat[i][j] += (1LL * a[i][k] * b[k][j]) % MOD; | ~~~~~~~~^ main.cpp: In function 'int main(int, char**)': main.cpp:58:13: note: 'mat' declared here 58 | int mat[2][2]; | ^~~