Compilare: user.cpp: In function ‘int main()’: user.cpp:41:43: warning: unused variable ‘x1’ [-Wunused-variable] int i, j, t, n, m, x, s1, s2, ans, minv, x1, x2, c; ^ user.cpp:41:47: warning: unused variable ‘x2’ [-Wunused-variable] int i, j, t, n, m, x, s1, s2, ans, minv, x1, x2, c; ^ user.cpp:37:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robo.in", "r", stdin); ^ user.cpp:38:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robo.out", "w", stdout); ^