Compilare: main.cpp: In function 'void solve()': main.cpp:359:7: warning: operation on 'Nr' may be undefined [-Wsequence-point] V1[++Nr] = V2[Nr] = i; ^~~~ main.cpp: In function 'void scan()': main.cpp:96:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(IN,"r",stdin); ^ main.cpp:97:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(OUT,"w",stdout); ^ main.cpp: In function 'void read(int&)': main.cpp:80:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,Pars,stdin),K =0; ^ main.cpp:89:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,Pars,stdin),K = 0; ^