Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:62:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘void rev()’: user.cpp:74:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Chain[i].size(); j++) ^ user.cpp: In function ‘int SolveQ(int, long long int)’: user.cpp:142:13: warning: unused variable ‘sum’ [-Wunused-variable] int sum = 0, f = node; ^ user.cpp:142:22: warning: unused variable ‘f’ [-Wunused-variable] int sum = 0, f = node; ^ user.cpp:138:9: warning: unused variable ‘ind’ [-Wunused-variable] int ind = 0, init = node; ^ user.cpp: In function ‘int findFather(int, int)’: user.cpp:107:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:188:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carray.out", "w", stdout); ^