Compilare: main.cpp: In function 'void solve2()': main.cpp:73:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r + pas < sol.size() && sol[r + pas] < E - sum) r += pas; ~~~~~~~~^~~~~~~~~~~~ main.cpp:80:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(dr < sol.size() && sol[dr] == sol[st]) ~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:90:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("eq4.in", "r", stdin); ^ main.cpp:91:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("eq4.out", "w", stdout); ^ main.cpp:94:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &cer); ^ main.cpp:95:31: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s + 1, 4 + L, stdin); ^ main.cpp:96:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lld", &a, &b, &E); ^