Compilare: main.cpp: In function 'int main()': main.cpp:31:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (a.size() <= m) { ~~~~~~~~~^~~~ main.cpp:8:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi5.in", "r", stdin); ^ main.cpp:9:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi5.out", "w", stdout); ^ main.cpp:12:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &c, &n, &m); ^ main.cpp:16:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &x); ^