Compilare: main.cpp: In constructor 'Node::Node(int)': main.cpp:9:13: warning: 'Node::v' will be initialized after [-Wreorder] int pr, v; ^ main.cpp:9:9: warning: 'int Node::pr' [-Wreorder] int pr, v; ^~ main.cpp:12:5: warning: when initialized here [-Wreorder] Node(int v): v(v), pr(dis(rng)), c(1) {l=r=0;} ^~~~ main.cpp: In function 'int main()': main.cpp:92:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mexc.in", "r", stdin); ^ main.cpp:93:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mexc.out", "w", stdout); ^ main.cpp:95:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &d); ^ main.cpp:99:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", mat[i]+j); ^