Compilare: user.cpp: In function ‘void solve()’: user.cpp:111:23: warning: unused variable ‘c’ [-Wunused-variable] int i, rez, a, b, c, t; ^ user.cpp:113:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:117:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &a, &b); ^