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 init(int, int)': main.cpp:65:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:109:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j = 0; i < o.size(); ++i) { ~~^~~~~~~~~~ main.cpp:110:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < o.size() && mat[o[j].first][o[j].second] ~~^~~~~~~~~~ main.cpp:91:35: 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:92:37: 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); ^