Compilare: user.cpp: In function ‘void sol()’: user.cpp:113:12: warning: variable ‘j’ set but not used [-Wunused-but-set-variable] int i, j; ^ user.cpp:118:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp:124:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x[i].l, &x[i].r); ^ user.cpp: In function ‘int main()’: user.cpp:168:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("klsecv.in", "r", stdin); ^ user.cpp:169:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("klsecv.out", "w", stdout); ^ user.cpp:172:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tt); ^