Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:19:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(it!=tata) ^ main.cpp: In function 'int main()': main.cpp:131:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<comp[i].size()-1; k++) ~^~~~~~~~~~~~~~~~~ main.cpp:132:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int kk=k+1; kk<comp[i].size(); kk++) ~~^~~~~~~~~~~~~~~ main.cpp:151:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<comp[z.st].size(); i++) ~^~~~~~~~~~~~~~~~~~ main.cpp:157:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<comp[it].size(); j++) ~^~~~~~~~~~~~~~~~ main.cpp:159:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<comp[z.st].size(); k++) ~^~~~~~~~~~~~~~~~~~ main.cpp:162:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k<comp[z.st].size()) break; ~^~~~~~~~~~~~~~~~~~ main.cpp:103:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ro.in","r",stdin); ^ main.cpp:104:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ro.out","w",stdout); ^ main.cpp:105:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:107:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ main.cpp:109:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ main.cpp: In function 'void dfs2(int)': main.cpp:64:20: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,mask,j,k,_mask; ^ main.cpp: In function 'int main()': main.cpp:164:101: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] if(((mask&(1<<j))==0 && ((z.nd&(1<<k))>0)) || ((mask&(1<<j))>0 && ((z.nd&(1<<k))==0))); ~~~~~~~~~~~~~~^~~~