Compilare: user.cpp: In function ‘int src(int)’: user.cpp:44:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp:50:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:63:24: warning: unused variable ‘m’ [-Wunused-variable] int n = nextnum(), m = nextnum(), edges = nextnum(); ^ user.cpp: In function ‘char nextch()’: user.cpp:12:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUF_SIZE, 1, fi); ^