Compilare: user.cpp: In function ‘void solve()’: user.cpp:42:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, nr, st, dr; ^ user.cpp:42:15: warning: unused variable ‘nr’ [-Wunused-variable] int i, j, nr, st, dr; ^ user.cpp:42:19: warning: unused variable ‘st’ [-Wunused-variable] int i, j, nr, st, dr; ^ user.cpp:42:23: warning: unused variable ‘dr’ [-Wunused-variable] int i, j, nr, st, dr; ^ user.cpp: In function ‘void readFile()’: user.cpp:111:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n", &t); ^ user.cpp:116:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n", &n); ^ user.cpp:118:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 200001, f); ^ user.cpp:138:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n", &m); ^ user.cpp:140:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 200001, f); ^