Compilare: main.cpp: In function 'int main()': main.cpp:42:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[i].size() ; ++j){ ~~^~~~~~~~~~~~~ main.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size() - 1 ; ++i){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp:61:21: warning: unused variable 'H1' [-Wunused-variable] int H1 = H[v[nod][i]]; ^~ main.cpp:62:21: warning: unused variable 'H2' [-Wunused-variable] int H2 = H[v[nod][i + 1]]; ^~ main.cpp:28:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdtree.in", "r", stdin); ^ main.cpp:29:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdtree.out", "w", stdout); ^ main.cpp:31:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ main.cpp:34:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^