Compilare: main.cpp: In function 'void solve()': main.cpp:119:12: warning: unused variable 'j' [-Wunused-variable] int i, j, cnt; ^ main.cpp: In function 'void read()': main.cpp:61:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("easychoice.in","r",stdin); ^ main.cpp: In function 'void cit(int&)': main.cpp:27:48: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(++pz == dim) fread(ax,1, dim, stdin),pz = 0; ^ main.cpp:37:46: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(++pz == dim) fread(ax,1,dim,stdin),pz = 0; ^ main.cpp: In function 'void solve()': main.cpp:133:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("easychoice.out","w",stdout); ^