Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:36:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(*it!=tata) ^ user.cpp: In function ‘void solve(int, int, int)’: user.cpp:56:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<comp[*it-n].size();i++) ^ user.cpp:81:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j1=0;j1<comp[nod-n].size() && ok;j1++) ^ user.cpp:83:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j2=j1+1;j2<comp[nod-n].size();j2++) ^ user.cpp:86:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else for(int j=0;j<comp[nod-n].size();j++) ^ user.cpp:92:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<comp[nod-n].size();j++) what[comp[nod-n][j]]=(i&(1<<j))>0; ^ user.cpp:94:23: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(*it!=tata) ^ user.cpp: In function ‘void build(int, int, int, int)’: user.cpp:110:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<comp[nod-n].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:119:33: 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); ^ user.cpp:120:35: 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); ^ user.cpp:122:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:123:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%d",&cost[i]); ^ user.cpp:126:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp: In function ‘void solve(int, int, int)’: user.cpp:55:41: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] int s1=inf,s2=inf,a1,a2,poz,lim=1<<comp[*it-n].size(); ^ user.cpp:63:48: warning: ‘a2’ may be used uninitialized in this function [-Wmaybe-uninitialized] d1[nod][1]+=s2;dad[*it-n][1]=a2; ^