Compilare: main.cpp: In function 'int main()': main.cpp:32:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.in", "r", stdin); ^ main.cpp:33:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.out", "w", stdout); ^ main.cpp:36:14: warning: iteration 100000 invokes undefined behavior [-Waggressive-loop-optimizations] t[i] = i; ~~~~~^~~ main.cpp:35:23: note: within this loop for (int i = 1; i <= dim; i++) { ~~^~~~~~