Compilare: main.cpp: In function 'void roy(int)': main.cpp:26:27: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(a[(k-1)%2][i][j]==a[(k-1)%2][i][k]+a[(k-1)%2][k][j]) ^ main.cpp: In function 'int main()': main.cpp:42:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rf.in","r",stdin); ^ main.cpp:43:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rf.out","w",stdout); ^ main.cpp:44:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:48:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[0][i][j]); ^