Compilare: user.cpp: In function ‘void kwaymerge(std::vector<std::vector<int> >, int, FILE*)’: user.cpp:89:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ~~^~~~~~~~~~ user.cpp:33:13: warning: large integer implicitly truncated to unsigned type [-Woverflow] #define INF 112131231313 ^ user.cpp:116:27: note: in expansion of macro ‘INF’ root.number = INF; ^~~ user.cpp: In function ‘int main()’: user.cpp:53:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%*c", &k); ^ user.cpp:59:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%*c", &n); ^ user.cpp:65:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%*c", &t); ^