Compilare: main.cpp: In function 'void foo(int, int, int)': main.cpp:13:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<dp[v].size()) ~^~~~~~~~~~~~~ main.cpp:24:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==dp[u].size() || y==vr.size()) ~^~~~~~~~~~~~~~ main.cpp:24:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==dp[u].size() || y==vr.size()) ~^~~~~~~~~~~ main.cpp:39:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(y!=vr.size() && count<=1000) ~^~~~~~~~~~~ main.cpp:46:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x!=dp[u].size() && count<=1000) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:76:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<a[i].size();j++) ~^~~~~~~~~~~~ main.cpp:60:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dwarf.in","r",stdin); ^ main.cpp:61:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dwarf.out","w",stdout); ^