Compilare: main.cpp: In function 'int main()': main.cpp:36:13: warning: unused variable 'k' [-Wunused-variable] int i,j,k; ^ main.cpp:34:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("1.in","r",stdin); ^ main.cpp:35:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("1.out","w",stdout); ^ main.cpp:37:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:40:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&val[i][j]); ^ main.cpp:56:16: warning: 'mj' may be used uninitialized in this function [-Wmaybe-uninitialized] drum(mi,mj); ^ main.cpp:56:16: warning: 'mi' may be used uninitialized in this function [-Wmaybe-uninitialized]