Compilare: main.cpp: In function 'int main()': main.cpp:13:19: warning: unused variable 'ii' [-Wunused-variable] int n,m,i,j,k,ii,jj,kk,rez; ^~ main.cpp:13:22: warning: unused variable 'jj' [-Wunused-variable] int n,m,i,j,k,ii,jj,kk,rez; ^~ main.cpp:13:25: warning: unused variable 'kk' [-Wunused-variable] int n,m,i,j,k,ii,jj,kk,rez; ^~ main.cpp:14:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("yinyang.in","r",stdin); ^ main.cpp:15:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("yinyang.out","w",stdout); ^ main.cpp:16:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:19:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^