Compilare: user.cpp: In function ‘void dfs(int, int, long long int)’: user.cpp:47:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘int par(int, int, long long int, std::priority_queue<Edge>)’: user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++){ ^ user.cpp:64:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[node].size(); j++) ^ user.cpp:79:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘char nextch()’: user.cpp:9:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^