Compilare: user.cpp: In function ‘int main()’: user.cpp:36:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st[j] < G[w[j]].size() && G[w[j]][st[j]] < prev) ^ user.cpp:38:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st[j] == G[w[j]].size()) ok = 0; ^ user.cpp:29:9: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] int b, sum; ^ user.cpp:18:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &m, &n); ^ user.cpp:20:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &w[i]); ^ user.cpp:24:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &v[i]); ^