Compilare: user.cpp: In function ‘void build(int, int, int)’: user.cpp:70:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < yseg[i][node].size(); j++) ^ user.cpp:89:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < yseg[i][node].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:156:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mindist.in", "r", stdin); ^ user.cpp:157:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mindist.out", "w", stdout); ^ user.cpp:208:70: warning: ‘up’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol = min(sol, x[i] + y[i] + query(2, 1, 1, n, 1, up, 1, y[i])); ^ user.cpp:209:72: warning: ‘low’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol = min(sol, -x[i] + y[i] + query(3, 1, 1, n, low, n, 1, y[i])); ^