Compilare: user.cpp: In function ‘int main()’: user.cpp:25:6: warning: unused variable ‘sw’ [-Wunused-variable] int sw = 1, y, fr, sec; ^ user.cpp:25:14: warning: unused variable ‘y’ [-Wunused-variable] int sw = 1, y, fr, sec; ^ user.cpp:25:21: warning: unused variable ‘sec’ [-Wunused-variable] int sw = 1, y, fr, sec; ^ user.cpp:14:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("borcane.in", "r", stdin); ^ user.cpp:15:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("borcane.out", "w", stdout); ^ user.cpp:17:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:19:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x), a.push_back(make_pair(x, i)); ^