Compilare: main.cpp: In function 'int main()': main.cpp:69:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nodes[curr].children.size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:75:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nodes[curr_node].parent_cnt == nodes[curr_node].parents.size()) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:97:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nodes[curr].parents.size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:103:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nodes[curr_node].child_cnt == nodes[curr_node].children.size()) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:33:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pm2.in", "r", stdin); ^ main.cpp:34:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pm2.out", "w", stdout); ^ main.cpp:36:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:40:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", duration + i); ^ main.cpp:45:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int cnt; scanf("%d", &cnt); ^ main.cpp:52:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int x; scanf("%d", &x); ^