Compilare: user.cpp: In function ‘void solve()’: user.cpp:40:15: warning: unused variable ‘nr’ [-Wunused-variable] int i, j, nr, st, dr, s = 0, h, x; ^ user.cpp:40:19: warning: unused variable ‘st’ [-Wunused-variable] int i, j, nr, st, dr, s = 0, h, x; ^ user.cpp:40:23: warning: unused variable ‘dr’ [-Wunused-variable] int i, j, nr, st, dr, s = 0, h, x; ^ user.cpp:40:27: warning: unused variable ‘s’ [-Wunused-variable] int i, j, nr, st, dr, s = 0, h, x; ^ user.cpp:40:34: warning: unused variable ‘h’ [-Wunused-variable] int i, j, nr, st, dr, s = 0, h, x; ^ user.cpp:40:37: warning: unused variable ‘x’ [-Wunused-variable] int i, j, nr, st, dr, s = 0, h, x; ^ user.cpp: In function ‘void readFile()’: user.cpp:142:26: 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:147:30: 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:149:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 200001, f); ^ user.cpp:167:30: 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:169:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 200001, f); ^