Compilare: user.cpp: In function ‘bool check(int, int)’: user.cpp:96:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] dp[nod][0][cul] = (gg.solve() == colors[nod].size()); ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ user.cpp:123:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] dp[nod][tata_cul][cul] = (gg.solve() == colors[nod].size()); ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:187:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ user.cpp:190:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&sz); ^ user.cpp:193:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&col); ^ user.cpp:198:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&to); ^