Compilare: user.cpp:14:0: warning: "INFINITY" redefined [enabled by default] #define INFINITY (1<<30) ^ In file included from /usr/include/math.h:40:0, from /usr/include/c++/4.8/cmath:44, from /usr/include/c++/4.8/random:38, from /usr/include/c++/4.8/bits/stl_algo.h:65, from /usr/include/c++/4.8/algorithm:62, from user.cpp:4: /usr/include/i386-linux-gnu/bits/inf.h:27:0: note: this is the location of the previous definition # define INFINITY (__builtin_inff()) ^ user.cpp: In function ‘int bfs()’: user.cpp:66:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i <= outN.size();++i) ^ user.cpp:81:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G_B[node].size();++i) ^ user.cpp: In function ‘int dfs(int)’: user.cpp:96:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G_B[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:152:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i <= comp_conx.size();++i) ^ user.cpp:155:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1;j <= comp_conx.size();++j) ^ user.cpp:158:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j > comp_conx.size()) ^ user.cpp:161:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1;j <= comp_conx.size();++j) ^ user.cpp:165:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j > comp_conx.size()) ^ user.cpp:172:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < inN.size();++i) ^ user.cpp:182:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i <= outN.size();++i) ^ user.cpp:191:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i <= outN.size();++i) ^ user.cpp:208:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0;i < outN1.size();++i)