Compilare: user.cpp: In function ‘void euler(int, int)’: user.cpp:58:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:121:37: 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:173:17: warning: unused variable ‘a1’ [-Wunused-variable] int a1 = queryBit(ind[b][0]), a2 = queryBit(ind[c][0]), a3 = 2 * queryBit(ind[node][1]); ^ user.cpp:173:43: warning: unused variable ‘a2’ [-Wunused-variable] int a1 = queryBit(ind[b][0]), a2 = queryBit(ind[c][0]), a3 = 2 * queryBit(ind[node][1]); ^ user.cpp:173:69: warning: unused variable ‘a3’ [-Wunused-variable] int a1 = queryBit(ind[b][0]), a2 = queryBit(ind[c][0]), a3 = 2 * queryBit(ind[node][1]); ^ user.cpp:136:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:139:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^ user.cpp:144:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^ user.cpp:158:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &m); ^ user.cpp:162:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &a, &b, &c); ^