Compilare: user.cpp: In function ‘int main()’: user.cpp:29:13: warning: unused variable ‘u’ [-Wunused-variable] int n, m, u, x, s1, s2, v, rez; ^ user.cpp:29:16: warning: unused variable ‘x’ [-Wunused-variable] int n, m, u, x, s1, s2, v, rez; ^ user.cpp:31:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d", &n, &m, &s1, &s2); ^ user.cpp:33:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &z, &y); ^