Compilare: main.cpp: In function 'void B(int)': main.cpp:37:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(b[i]=j=0,k=v[i].size();j<k;j++) ~^~ main.cpp: In function 'int main()': main.cpp:43:93: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in","r",stdin),freopen("ctc.out","w",stdout),fread(q,1,M,stdin),n=C(),m=C(); ^ main.cpp:43:93: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:43:93: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]