Compilare: user.cpp: In function ‘void soll(int)’: user.cpp:35:17: warning: unused variable ‘s2’ [-Wunused-variable] int sa = 0, s2 = 0; ^ user.cpp: In function ‘void sol(int)’: user.cpp:102:24: warning: statement has no effect [-Wunused-value] ++x[i].l; x[i].r; ^ user.cpp:100:39: 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:135:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("constant.in", "r", stdin); ^ user.cpp:136:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("constant.out", "w", stdout); ^ user.cpp:139:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tt); ^ user.cpp:141:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &q); ^