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:57:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<comp[*it-n].size();i++) ^ user.cpp:59:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d[*it-n].size();i++) ^ user.cpp:76:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d[nod-n].size();i++) ^ user.cpp:79:48: 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:81:23: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(*it!=tata) ^ user.cpp: In function ‘void build(int, int, int, int)’: user.cpp:97:40: 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:125:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i1=0;i1<comp[i].size() && !d[i][j];i1++) ^ user.cpp:127:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i2=i1+1;i2<comp[i].size();i2++) ^ user.cpp:131:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i1=0;i1<comp[i].size();i1++) ^ user.cpp:106:33: 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:107:35: 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:109:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:110:47: 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:113:28: 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)’: