Compilare: main.cpp: In function 'int main()': main.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < ab.size(); ++i) ab[i] += ab[i - 1]; ~~^~~~~~~~~~~ main.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = start; i < ab.size(); ++i) { ~~^~~~~~~~~~~ main.cpp:42:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(posinam + 1 < inam.size()) valinam = inam[posinam + 1]; ~~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:43:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(posa + 1 < a.size()) vala = a[posa + 1]; ~~~~~~~~~^~~~~~~~~~ main.cpp:44:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(posb + 1 < b.size()) valb = b[posb + 1]; ~~~~~~~~~^~~~~~~~~~ main.cpp:16:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("grup.in", "r", stdin); ^ main.cpp:17:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("grup.out", "w", stdout); ^ main.cpp:18:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld%lld", &n, &s, &k1, &k2); ^ main.cpp:19:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= n; ++i) scanf("%lld", &v[i]); ^ main.cpp:20:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s", s1 + 1, s2 + 1); ^