Compilare: user.cpp: In function ‘void build()’: user.cpp:70:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < nodes[i].size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:248:53: warning: unused variable ‘mid’ [-Wunused-variable] int left = level[x[i]], right = maxlev, mid, admax; ^ user.cpp:198:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("neapuiu.in", "r", stdin); ^ user.cpp:199:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("neapuiu.out", "w", stdout); ^ user.cpp:201:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &n, &m); ^ user.cpp:204:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &a, &b); ^ user.cpp:212:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &type[i]); ^ user.cpp:215:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &x[i], &y[i]); ^ user.cpp:221:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &x[i]); ^ user.cpp:260:43: warning: ‘admax’ may be used uninitialized in this function [-Wmaybe-uninitialized] query(1, 1, nodes[admax].size(), start[admax], interv.first + 1, interv.second + 1); ^