Compilare: user.cpp: In function ‘void remove_r(int)’: user.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (SR[i].p != pos) SR[++SR[0].s] = SR[i]; ^ user.cpp: In function ‘int solve(int)’: user.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l <= SL[0] && r > 0){ ^ user.cpp:51:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (r && SRval(r) + SL[l] > S) --r; ^ user.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (SRval(r) + SL[l] == S){ ^ user.cpp:57:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (nextL <= SL[0] && SL[l] == SL[nextL]) ++nextL; ^ user.cpp:62:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else for (++l; SL[l] == SL[l - 1] && l <= SL[0]; ++l); ^ user.cpp: In function ‘int main()’: user.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= N; ++i) scanf("%d", &A[i]); ^ user.cpp:80:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 4; i <= N; ++i) ^ user.cpp:81:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j <= N; ++j) ^ user.cpp:89:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 3; i <= N - 2; ++i){ ^ user.cpp:68:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("take5.in", "r", stdin); ^ user.cpp:69:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("take5.out", "w", stdout); ^ user.cpp:71:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &S); ^ user.cpp:72:49: 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("%d", &A[i]); ^