Compilare: user.cpp: In function ‘void glin1(int, bool)’: user.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < g[x].size()) { ^ user.cpp:12:13: warning: unused variable ‘len’ [-Wunused-variable] int i, x, len; ^ user.cpp: In function ‘int geli(int)’: user.cpp:45:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < g[x].size()) { ^ user.cpp: In function ‘int main()’: user.cpp:73:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < lin.size(); ++j) { ^ user.cpp:93:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < lin.size(); ++i) { ^ user.cpp:98:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < lin.size(); ++j) { ^ user.cpp:101:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < lin.size(); ++j) { ^ user.cpp:58:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.cpp:60:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &x, &y); ^