Compilare: main.cpp: In function 'int main()': main.cpp:160:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < dy[i].size (); j++) ~~^~~~~~~~~~~~~~~ main.cpp:185:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < dx[i].size (); j++) ~~^~~~~~~~~~~~~~~ main.cpp:189:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (k < dx[i].size () && dx[i][k].type == ENEMY) ~~^~~~~~~~~~~~~~~ main.cpp:196:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l == dx[i].size ()) ~~^~~~~~~~~~~~~~~~ main.cpp:125:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tower.in", "r", stdin); ^ main.cpp:126:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tower.out", "w", stdout); ^